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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Search in Rotated Sorted Array** (Medium)\n\nAn integer array `nums` is sorted in ascending order and then rotated at some pivot. Given the array after rotation and an integer `target`, return the index of `target` if it is in `nums`, or -1 if it is not.\n\nPlease provide a so...
{ "category": "binary_search", "difficulty": "medium", "language": "python", "title": "Search in Rotated Sorted Array" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Daily Temperatures** (Medium)\n\nGiven an array of integers `temperatures` representing daily temperatures, return an array `answer` such that `answer[i]` is the number of days you have to wait after the `i`-th day to get a warmer temperature. If there is no future day with a ...
{ "category": "stack_queue", "difficulty": "medium", "language": "python", "title": "Daily Temperatures" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "**Coin Change** (Medium)\n\nYou are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money. Return the fewest number of coins needed to make up that amount. If that amount of money cannot be made ...
{ "category": "dynamic_programming", "difficulty": "medium", "language": "python", "title": "Coin Change" }
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[ { "from": "human", "value": "How would you answer: 'Tell me about a significant technical mistake you made and what you learned from it.'" }, { "from": "gpt", "value": "**Strong Answer:**\n\n**The Mistake:**\nTwo years ago, I was deploying a database schema migration on a production PostgreSQL t...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Describe a Time You Made a Mistake" }
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[ { "from": "human", "value": "**Two Sum** (Easy)\n\nGiven an array of integers `nums` and an integer `target`, return the indices of the two numbers that add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice.\n\nPlease provide a solutio...
{ "category": "arrays_hashing", "difficulty": "easy", "language": "python", "title": "Two Sum" }
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[ { "from": "human", "value": "**Group Anagrams** (Medium)\n\nGiven an array of strings `strs`, group the anagrams together. You can return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." }, { ...
{ "category": "arrays_hashing", "difficulty": "medium", "language": "python", "title": "Group Anagrams" }
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[ { "from": "human", "value": "**Coin Change** (Medium)\n\nYou are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money. Return the fewest number of coins needed to make up that amount. If that amount of money cannot be made ...
{ "category": "dynamic_programming", "difficulty": "medium", "language": "python", "title": "Coin Change" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "Design a scalable notification system that supports push notifications, email, and SMS. The system should handle millions of users and support different notification types with user preferences." }, { "from": "gpt", "value": "## System Design: Notification System\n\n...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Notification System" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Coin Change** (Medium)\n\nYou are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money. Return the fewest number of coins needed to make up that amount. If that amount of money cannot be made ...
{ "category": "dynamic_programming", "difficulty": "medium", "language": "python", "title": "Coin Change" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "**Group Anagrams** (Medium)\n\nGiven an array of strings `strs`, group the anagrams together. You can return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." }, { ...
{ "category": "arrays_hashing", "difficulty": "medium", "language": "python", "title": "Group Anagrams" }
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[ { "from": "human", "value": "Design a scalable notification system that supports push notifications, email, and SMS. The system should handle millions of users and support different notification types with user preferences." }, { "from": "gpt", "value": "## System Design: Notification System\n\n...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Notification System" }
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[ { "from": "human", "value": "**Daily Temperatures** (Medium)\n\nGiven an array of integers `temperatures` representing daily temperatures, return an array `answer` such that `answer[i]` is the number of days you have to wait after the `i`-th day to get a warmer temperature. If there is no future day with a ...
{ "category": "stack_queue", "difficulty": "medium", "language": "python", "title": "Daily Temperatures" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "Design a scalable notification system that supports push notifications, email, and SMS. The system should handle millions of users and support different notification types with user preferences." }, { "from": "gpt", "value": "## System Design: Notification System\n\n...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Notification System" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "How would you answer: 'Tell me about a significant technical mistake you made and what you learned from it.'" }, { "from": "gpt", "value": "**Strong Answer:**\n\n**The Mistake:**\nTwo years ago, I was deploying a database schema migration on a production PostgreSQL t...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Describe a Time You Made a Mistake" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Longest Substring Without Repeating Characters** (Medium)\n\nGiven a string `s`, find the length of the longest substring without repeating characters.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edg...
{ "category": "sliding_window", "difficulty": "medium", "language": "python", "title": "Longest Substring Without Repeating Characters" }
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[ { "from": "human", "value": "**Course Schedule II (Topological Sort)** (Hard)\n\nThere are `numCourses` courses labeled from 0 to numCourses-1. Given `prerequisites[i] = [a, b]` meaning you must take course b before course a, return the ordering of courses you should take to finish all courses. If impossibl...
{ "category": "graphs", "difficulty": "hard", "language": "python", "title": "Course Schedule II (Topological Sort)" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "**Search in Rotated Sorted Array** (Medium)\n\nAn integer array `nums` is sorted in ascending order and then rotated at some pivot. Given the array after rotation and an integer `target`, return the index of `target` if it is in `nums`, or -1 if it is not.\n\nPlease provide a so...
{ "category": "binary_search", "difficulty": "medium", "language": "python", "title": "Search in Rotated Sorted Array" }
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[ { "from": "human", "value": "**Course Schedule II (Topological Sort)** (Hard)\n\nThere are `numCourses` courses labeled from 0 to numCourses-1. Given `prerequisites[i] = [a, b]` meaning you must take course b before course a, return the ordering of courses you should take to finish all courses. If impossibl...
{ "category": "graphs", "difficulty": "hard", "language": "python", "title": "Course Schedule II (Topological Sort)" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "**Search in Rotated Sorted Array** (Medium)\n\nAn integer array `nums` is sorted in ascending order and then rotated at some pivot. Given the array after rotation and an integer `target`, return the index of `target` if it is in `nums`, or -1 if it is not.\n\nPlease provide a so...
{ "category": "binary_search", "difficulty": "medium", "language": "python", "title": "Search in Rotated Sorted Array" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "Design a URL shortening service like bit.ly. The system should support: creating short URLs from long URLs, redirecting short URLs to original URLs, and optionally tracking click analytics." }, { "from": "gpt", "value": "## System Design: URL Shortener\n\n### Require...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a URL Shortener" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "How would you answer: 'Tell me about a significant technical mistake you made and what you learned from it.'" }, { "from": "gpt", "value": "**Strong Answer:**\n\n**The Mistake:**\nTwo years ago, I was deploying a database schema migration on a production PostgreSQL t...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Describe a Time You Made a Mistake" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "Design a URL shortening service like bit.ly. The system should support: creating short URLs from long URLs, redirecting short URLs to original URLs, and optionally tracking click analytics." }, { "from": "gpt", "value": "## System Design: URL Shortener\n\n### Require...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a URL Shortener" }
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[ { "from": "human", "value": "**Longest Substring Without Repeating Characters** (Medium)\n\nGiven a string `s`, find the length of the longest substring without repeating characters.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edg...
{ "category": "sliding_window", "difficulty": "medium", "language": "python", "title": "Longest Substring Without Repeating Characters" }
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[ { "from": "human", "value": "**Search in Rotated Sorted Array** (Medium)\n\nAn integer array `nums` is sorted in ascending order and then rotated at some pivot. Given the array after rotation and an integer `target`, return the index of `target` if it is in `nums`, or -1 if it is not.\n\nPlease provide a so...
{ "category": "binary_search", "difficulty": "medium", "language": "python", "title": "Search in Rotated Sorted Array" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Course Schedule II (Topological Sort)** (Hard)\n\nThere are `numCourses` courses labeled from 0 to numCourses-1. Given `prerequisites[i] = [a, b]` meaning you must take course b before course a, return the ordering of courses you should take to finish all courses. If impossibl...
{ "category": "graphs", "difficulty": "hard", "language": "python", "title": "Course Schedule II (Topological Sort)" }
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[ { "from": "human", "value": "Design a scalable notification system that supports push notifications, email, and SMS. The system should handle millions of users and support different notification types with user preferences." }, { "from": "gpt", "value": "## System Design: Notification System\n\n...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Notification System" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Group Anagrams** (Medium)\n\nGiven an array of strings `strs`, group the anagrams together. You can return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." }, { ...
{ "category": "arrays_hashing", "difficulty": "medium", "language": "python", "title": "Group Anagrams" }
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[ { "from": "human", "value": "**Longest Substring Without Repeating Characters** (Medium)\n\nGiven a string `s`, find the length of the longest substring without repeating characters.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edg...
{ "category": "sliding_window", "difficulty": "medium", "language": "python", "title": "Longest Substring Without Repeating Characters" }
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[ { "from": "human", "value": "How would you answer: 'Tell me about a significant technical mistake you made and what you learned from it.'" }, { "from": "gpt", "value": "**Strong Answer:**\n\n**The Mistake:**\nTwo years ago, I was deploying a database schema migration on a production PostgreSQL t...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Describe a Time You Made a Mistake" }
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[ { "from": "human", "value": "**Subsets** (Medium)\n\nGiven an integer array `nums` of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order.\n\nPlease provide a solution in python with a clear explanation of the ap...
{ "category": "backtracking", "difficulty": "medium", "language": "python", "title": "Subsets" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Top K Frequent Elements** (Medium)\n\nGiven an integer array `nums` and an integer `k`, return the `k` most frequent elements. You may return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and an...
{ "category": "heap_priority_queue", "difficulty": "medium", "language": "python", "title": "Top K Frequent Elements" }
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[ { "from": "human", "value": "**Coin Change** (Medium)\n\nYou are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money. Return the fewest number of coins needed to make up that amount. If that amount of money cannot be made ...
{ "category": "dynamic_programming", "difficulty": "medium", "language": "python", "title": "Coin Change" }
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[ { "from": "human", "value": "How would you answer: 'Tell me about a significant technical mistake you made and what you learned from it.'" }, { "from": "gpt", "value": "**Strong Answer:**\n\n**The Mistake:**\nTwo years ago, I was deploying a database schema migration on a production PostgreSQL t...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Describe a Time You Made a Mistake" }
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[ { "from": "human", "value": "**Coin Change** (Medium)\n\nYou are given an integer array `coins` representing coins of different denominations and an integer `amount` representing a total amount of money. Return the fewest number of coins needed to make up that amount. If that amount of money cannot be made ...
{ "category": "dynamic_programming", "difficulty": "medium", "language": "python", "title": "Coin Change" }
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[ { "from": "human", "value": "Design a scalable notification system that supports push notifications, email, and SMS. The system should handle millions of users and support different notification types with user preferences." }, { "from": "gpt", "value": "## System Design: Notification System\n\n...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Notification System" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "How would you answer the behavioral interview question: 'Tell me about a time you disagreed with your manager or a technical decision, and how you handled it.'" }, { "from": "gpt", "value": "**Strong Answer (STAR Format):**\n\n**Situation:**\nAt my previous role, our...
{ "category": "behavioral", "difficulty": "medium", "language": "behavioral", "title": "Tell Me About a Time You Disagreed With Your Manager" }
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[ { "from": "human", "value": "**Binary Tree Level Order Traversal** (Medium)\n\nGiven the root of a binary tree, return the level order traversal of its nodes' values (i.e., from left to right, level by level).\n\nPlease provide a solution in python with a clear explanation of the approach, time/space comple...
{ "category": "trees", "difficulty": "medium", "language": "python", "title": "Binary Tree Level Order Traversal" }
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[ { "from": "human", "value": "**Course Schedule II (Topological Sort)** (Hard)\n\nThere are `numCourses` courses labeled from 0 to numCourses-1. Given `prerequisites[i] = [a, b]` meaning you must take course b before course a, return the ordering of courses you should take to finish all courses. If impossibl...
{ "category": "graphs", "difficulty": "hard", "language": "python", "title": "Course Schedule II (Topological Sort)" }
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[ { "from": "human", "value": "Design a rate limiter that can be used as middleware for a web API. Support multiple rate limiting strategies and work across distributed servers." }, { "from": "gpt", "value": "## System Design: Distributed Rate Limiter\n\n### Requirements\n- Limit requests per user...
{ "category": "system_design", "difficulty": "hard", "language": "conceptual", "title": "Design a Rate Limiter" }
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[ { "from": "human", "value": "**Edit Distance (Levenshtein Distance)** (Hard)\n\nGiven two strings `word1` and `word2`, return the minimum number of operations required to convert `word1` to `word2`. Operations allowed: insert a character, delete a character, replace a character.\n\nPlease provide a solution...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Edit Distance (Levenshtein Distance)" }
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[ { "from": "human", "value": "**Reverse a Linked List** (Easy)\n\nGiven the head of a singly linked list, reverse the list and return the reversed list's head. Solve it both iteratively and recursively.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, an...
{ "category": "linked_list", "difficulty": "easy", "language": "python", "title": "Reverse a Linked List" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Search in Rotated Sorted Array** (Medium)\n\nAn integer array `nums` is sorted in ascending order and then rotated at some pivot. Given the array after rotation and an integer `target`, return the index of `target` if it is in `nums`, or -1 if it is not.\n\nPlease provide a so...
{ "category": "binary_search", "difficulty": "medium", "language": "python", "title": "Search in Rotated Sorted Array" }
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[ { "from": "human", "value": "**Container With Most Water** (Medium)\n\nGiven an integer array `height` of length n, where each element represents the height of a vertical line at position i. Find two lines that together with the x-axis form a container that holds the most water. Return the maximum amount of...
{ "category": "two_pointers", "difficulty": "medium", "language": "python", "title": "Container With Most Water" }
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[ { "from": "human", "value": "**Longest Increasing Subsequence** (Hard)\n\nGiven an integer array `nums`, return the length of the longest strictly increasing subsequence.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." ...
{ "category": "dynamic_programming", "difficulty": "hard", "language": "python", "title": "Longest Increasing Subsequence" }
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[ { "from": "human", "value": "**Daily Temperatures** (Medium)\n\nGiven an array of integers `temperatures` representing daily temperatures, return an array `answer` such that `answer[i]` is the number of days you have to wait after the `i`-th day to get a warmer temperature. If there is no future day with a ...
{ "category": "stack_queue", "difficulty": "medium", "language": "python", "title": "Daily Temperatures" }
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[ { "from": "human", "value": "**Group Anagrams** (Medium)\n\nGiven an array of strings `strs`, group the anagrams together. You can return the answer in any order.\n\nPlease provide a solution in python with a clear explanation of the approach, time/space complexity, and any important edge cases." }, { ...
{ "category": "arrays_hashing", "difficulty": "medium", "language": "python", "title": "Group Anagrams" }
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