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You are given a string `s` that consists of lowercase English letters and digits. You can swap any two characters in the string as many times as you want. Your goal is to form the largest possible valid integer from the given string. A valid integer should not contain any leading zeroes unless it is zero itself. Const...	<think> Okay, I need to solve this problem where I have to find the largest possible valid integer from a given string. The string can include lowercase letters and digits. I can rearrange any characters as I like, but the integer must be valid. So, what's a valid integer? Oh right, it shouldn't have leading zeros unle...	[ { "from": "human", "value": "You are given a string `s` that consists of lowercase English letters and digits. You can swap any two characters in the string as many times as you want. Your goal is to form the largest possible valid integer from the given string. A valid integer should not contain any leadin...
Alice is working with an array of integers and wants to perform a series of operations on it. The operations involve finding the minimum value in a subarray and then updating the entire subarray with this minimum value. Given the initial array and the operations, can you write a program to help her find the final modif...	<think> Okay, so I've got this problem where Alice is performing some operations on an array, and I need to find the final state after all operations. Let me try to understand what's happening. The problem statement says that each operation is defined by L and R, and for that subarray, we find the minimum value and th...	[ { "from": "human", "value": "Alice is working with an array of integers and wants to perform a series of operations on it. The operations involve finding the minimum value in a subarray and then updating the entire subarray with this minimum value. Given the initial array and the operations, can you write a...
You are given an alien language with unique rules for constructing valid words. Each letter has a rank, and a word is considered valid if its letters are in strictly increasing rank order. Your task is to calculate the total number of distinct valid words of a given length $L$ that can be formed using an alphabet of si...	<think> Okay, so I have this problem where I need to calculate the number of distinct valid words of a certain length L using an alphabet of size N. The rule is that each letter must be in strictly increasing rank order. Hmm, let me think about this. The problem is similar to something I've heard before, like combinat...	[ { "from": "human", "value": "You are given an alien language with unique rules for constructing valid words. Each letter has a rank, and a word is considered valid if its letters are in strictly increasing rank order. Your task is to calculate the total number of distinct valid words of a given length $L$ t...
Write a function named calculateDiscount that takes two parameters: originalPrice, which is a positive float representing the price of an item before any discount, and discountPercentage, which is a float representing the discount percentage to be applied to the original price. The function should return the final pric...	<think> Okay, I need to write a Python function called calculateDiscount that takes two parameters: originalPrice and discountPercentage. The function should return the final price after applying the discount. But wait, if the discountPercentage is less than 0 or greater than 100, I should return -1, meaning it's inval...	[ { "from": "human", "value": "Write a function named calculateDiscount that takes two parameters: originalPrice, which is a positive float representing the price of an item before any discount, and discountPercentage, which is a float representing the discount percentage to be applied to the original price. ...
A top employee in a company wants to organize the recycling schedules for different departments. The company has n departments, and each department needs to recycle on a specific day of the week — either Monday, Tuesday, Wednesday, Thursday, or Friday. Each department can only recycle on one of these days. Each depart...	<think> Okay, so I've got this problem to solve. Let me read through the problem carefully. The task is to determine if it's possible to organize the recycling schedules for different departments such that all constraints are satisfied. Each department must recycle on a specific day from Monday to Friday, but each can...	[ { "from": "human", "value": "A top employee in a company wants to organize the recycling schedules for different departments. The company has n departments, and each department needs to recycle on a specific day of the week — either Monday, Tuesday, Wednesday, Thursday, or Friday. Each department can only r...
Given an array of integers nums and an integer k, return the maximum length of a subarray that sums to k. If there isn't one, return 0 instead. Example 1: Input: nums = [1, -1, 5, -2, 3], k = 3 Output: 4 Explanation: The subarray [1, -1, 5, -2] sums to 3 and is the longest subarray that sums to k. Example 2: Input: n...	<think> Okay, I need to solve this problem where I have to find the maximum length of a subarray that sums to a given value k. Hmm, let's think about the problem. So the input is an array of integers and an integer k. I need to return the maximum length of a contiguous subarray (subarray must be contiguous) whose sum ...	[ { "from": "human", "value": "Given an array of integers nums and an integer k, return the maximum length of a subarray that sums to k. If there isn't one, return 0 instead.\n\nExample 1:\nInput: nums = [1, -1, 5, -2, 3], k = 3\nOutput: 4\nExplanation: The subarray [1, -1, 5, -2] sums to 3 and is the longest...
Write a program which reads an integer `n` and a list of `n` integers, and prints the maximum difference between any two elements in the list. Constraints * 1 ≤ n ≤ 100 * 0 ≤ list elements ≤ 1000 Input An integer `n` is given in the first line. The second line contains `n` integers separated by single space. Outp...	<think> Okay, so I have to write a Python program that reads an integer n and then a list of n integers. Then, I need to find the maximum difference between any two elements in that list and print it. Hmm, let's think about how to approach this. Wait, the maximum difference, does that mean the difference between the l...	[ { "from": "human", "value": "Write a program which reads an integer `n` and a list of `n` integers, and prints the maximum difference between any two elements in the list.\n\nConstraints\n\n* 1 ≤ n ≤ 100\n* 0 ≤ list elements ≤ 1000\n\nInput\n\nAn integer `n` is given in the first line. \nThe second line con...
Calculate the number of ways to partition a given positive integer N into the sum of two distinct positive integers a and b (where a > b and both a and b are positive integers). Constraints * 2 \leq N \leq 10^9 Input Input is given from Standard Input in the following format: N Output Output one integer represen...	<think> Okay, I need to solve this problem where I have to find the number of ways to partition a positive integer N into two distinct positive integers a and b, such that a > b. Hmm, let's think about how to approach this. So, the problem says that a and b must be positive integers, distinct, and their sum is N. Also...	[ { "from": "human", "value": "Calculate the number of ways to partition a given positive integer N into the sum of two distinct positive integers a and b (where a > b and both a and b are positive integers).\n\nConstraints\n\n* 2 \\leq N \\leq 10^9\n\nInput\n\nInput is given from Standard Input in the follow...
You are given a list of tasks `tasks` that need to be executed on a CPU. Each task is represented by a character, and each task can be executed in one unit of time. However, there is a cooling interval `n` between the same kind of task executions. Return the least number of units of times that the CPU will take to fin...	<think> Okay, I need to solve this problem where I have to find the minimum number of time units required to execute all tasks on a CPU with a cooling interval. Hmm, what's the problem statement again? So, each task is a character, and each takes one unit of time to execute. But if the same task is done, there's a coo...	[ { "from": "human", "value": "You are given a list of tasks `tasks` that need to be executed on a CPU. Each task is represented by a character, and each task can be executed in one unit of time. However, there is a cooling interval `n` between the same kind of task executions.\n\nReturn the least number of u...
In a software company, there is an ongoing project that consists of several modules. Each module has dependencies on some other modules, which means a module can only start once all its dependent modules are completed. To ensure smooth project flow, the project manager wants an automated system to determine the order i...	<think> Okay, so I have to solve this problem where I need to find the order of completing modules based on their dependencies. Hmm, right, this sounds familiar. It's a topological sorting problem, right. Topological sorting is used to order the elements of a directed acyclic graph (DAG) such that for every directed e...	[ { "from": "human", "value": "In a software company, there is an ongoing project that consists of several modules. Each module has dependencies on some other modules, which means a module can only start once all its dependent modules are completed. To ensure smooth project flow, the project manager wants an ...
Given a list of integers, determine if the integers can form an arithmetic progression when arranged in some order. An arithmetic progression is a sequence of numbers in which the difference of any two successive members is a constant. Example 1: Input: arr = [3, 5, 1] Output: true Explanation: Rearranging the array a...	<think> Okay, I need to solve this problem where I have to determine if a given list of integers can be rearranged into an arithmetic progression. Hmm, let me think about what an arithmetic progression (AP) requires. An AP is a sequence where the difference between consecutive elements is constant. So, after sorting, ...	[ { "from": "human", "value": "Given a list of integers, determine if the integers can form an arithmetic progression when arranged in some order. An arithmetic progression is a sequence of numbers in which the difference of any two successive members is a constant.\n\nExample 1:\nInput: arr = [3, 5, 1]\nOutp...
You are required to write a function that takes a string of mixed-case alphabetical characters and determines if it contains every letter of the alphabet at least once (case-insensitive). Return `True` if the string is a pangram and `False` otherwise. A pangram is a sentence that contains every letter of the alphabet ...	<think> Okay, I need to write a Python function called, I guess, is_pangram, which takes a string and returns True if it's a pangram. Hmm, a pangram has every letter of the alphabet at least once, case-insensitive. So, the function should process the input string, check for each letter a-z whether it's present, regardl...	[ { "from": "human", "value": "You are required to write a function that takes a string of mixed-case alphabetical characters and determines if it contains every letter of the alphabet at least once (case-insensitive). Return `True` if the string is a pangram and `False` otherwise.\n\nA pangram is a sentence ...
# Task Write a function to determine whether an input string of parentheses (composed only of characters '(' and ')') is valid. A string is considered valid if: 1. Every open parenthesis '(' has a corresponding close parenthesis ')'. 2. Open parentheses must be closed in the correct order. # Input - A string `s` whi...	<think> Okay, I need to write a Python function to determine if a string of parentheses is valid. Let's see, the string is only made of '(' and ')'. The rules are that every open must have a corresponding close, and they must be correctly ordered. Hmm, I remember that a common approach for this kind of problem is usin...	[ { "from": "human", "value": "# Task\n\nWrite a function to determine whether an input string of parentheses (composed only of characters '(' and ')') is valid. A string is considered valid if:\n\n1. Every open parenthesis '(' has a corresponding close parenthesis ')'.\n2. Open parentheses must be closed in ...
Given an array of integers, return a new array where each element is the product of all the integers in the original array except for the element at that index. ### Examples ``` arrayProduct([1, 2, 3, 4]) -> [24, 12, 8, 6] arrayProduct([5, 6, 7]) -> [42, 35, 30] arrayProduct([2, 4, 6, 8, 10]) -> [1920, 960...	<think> Okay, I need to solve this problem where I'm given an array of integers and I have to return a new array. Each element in this new array should be the product of all the integers in the original array except for the element at that index. Hmm, let's see how to approach this. So, thinking about the examples giv...	[ { "from": "human", "value": "Given an array of integers, return a new array where each element is the product of all the integers in the original array except for the element at that index.\n\n### Examples\n\n```\narrayProduct([1, 2, 3, 4]) -> [24, 12, 8, 6]\narrayProduct([5, 6, 7]) -> [42, 35, 3...
# Task Given a list of integers, rearrange the list so that all even numbers appear before all odd numbers while maintaining their relative order. # Example For `arr = [3, 1, 2, 4]` The result should be `[2, 4, 3, 1]` # Input/Output - `[input]` array of integers `arr` - `[output]` an array of integers ### Forma...	<think> Okay, I need to solve this problem where I have to rearrange a list of integers such that all even numbers come before the odd numbers, but their relative order is maintained. Hmm, so the even numbers should appear in the same order as they were in the original list, and the same goes for the odd numbers. And a...	[ { "from": "human", "value": "# Task\nGiven a list of integers, rearrange the list so that all even numbers appear before all odd numbers while maintaining their relative order. \n\n# Example\n\nFor `arr = [3, 1, 2, 4]`\n\nThe result should be `[2, 4, 3, 1]`\n\n# Input/Output\n\n- `[input]` array of integers...
Tom loves designing board games and wants to create a new game that involves moving a character on a grid. The grid is represented as a matrix of cells, where each cell can either be passable or impassable. Tom needs help to ensure that the character can reach a specific cell from a starting cell following a set of mov...	<think> Okay, so I have to solve this problem where I need to determine if a character can move from a starting cell to a target cell on a grid. The grid is made up of 0s and 1s, where 0 is passable and 1 is not. The character can only move up, down, left, or right—no diagonals. Hmm, the first thing I think is that th...	[ { "from": "human", "value": "Tom loves designing board games and wants to create a new game that involves moving a character on a grid. The grid is represented as a matrix of cells, where each cell can either be passable or impassable. Tom needs help to ensure that the character can reach a specific cell fr...
In a certain small town, there is a popular game played among the children. The game involves collecting stickers of different animals. Each sticker has an animal name on it and there are only five distinct types of stickers available: "tiger", "elephant", "rabbit", "lion", and "giraffe". Given a list of stickers col...	<think> Okay, I need to solve this problem where I have to determine if a child's sticker collection contains all five types of animals. Let me think about how to approach this. So the problem statement says that there are five distinct types of stickers: tiger, elephant, rabbit, lion, and giraffe. The child wins if e...	[ { "from": "human", "value": "In a certain small town, there is a popular game played among the children. The game involves collecting stickers of different animals. Each sticker has an animal name on it and there are only five distinct types of stickers available: \"tiger\", \"elephant\", \"rabbit\", \"lion...
# Description: Given an array of integers `nums` and an integer `k`, your task is to determine whether there are two distinct indices `i` and `j` in the array such that `nums[i] = nums[j]` and the absolute difference between `i` and `j` is at most `k`. For example: ``` nums = [1, 2, 3, 1], k = 3 containsNearbyDuplicat...	<think> Okay, I need to solve this problem where I have to determine if there are two distinct indices i and j in an array such that the elements at those indices are equal and the absolute difference between i and j is at most k. Hmm. Let me think about the constraints. The function should run in O(n) time, which sug...	[ { "from": "human", "value": "# Description:\nGiven an array of integers `nums` and an integer `k`, your task is to determine whether there are two distinct indices `i` and `j` in the array such that `nums[i] = nums[j]` and the absolute difference between `i` and `j` is at most `k`.\n\nFor example:\n```\nnum...
A company organizes a string manipulation contest in which participants are required to transform a given string. The challenge is to remove duplicates such that each character appears only once and the resulting string is the lexicographically smallest possible. For example, given the string `bcabc`, the result shoul...	<think> Okay, I need to solve this problem where I have to remove duplicates from a string such that each character appears only once, and the resulting string is the lexicographically smallest possible. Hmm, let's think about how to approach this. So, the input is a string, like 'bcabc' and the output should be 'abc'...	[ { "from": "human", "value": "A company organizes a string manipulation contest in which participants are required to transform a given string. The challenge is to remove duplicates such that each character appears only once and the resulting string is the lexicographically smallest possible.\n\nFor example,...
Title: Efficient Tractor Allocation for Farmland Prompt: A farm has 'n' rectangular fields arranged in a strictly linear sequence, each described by its width and cost. The farmer wishes to plow some consecutive sequence of fields using a tractor that charges a fixed overhead cost for every distinct sequenc...	<think> Okay, let's tackle this problem. Hmm, I need to find the minimum possible total expense for the farmer when he plows some consecutive fields. So, the tractor charges a fixed overhead cost per sequence plus the sum of the individual costs of the fields in that sequence. The farmer can choose any consecutive se...	[ { "from": "human", "value": "Title: Efficient Tractor Allocation for Farmland\n\nPrompt: \n\nA farm has 'n' rectangular fields arranged in a strictly linear sequence, each described by its width and cost. The farmer wishes to plow some consecutive sequence of fields using a tractor that charges a f...
Sam loves to play with numbers. He recently learned about prime numbers and wanted to dive deeper into understanding their properties. He came up with an interesting problem involving prime numbers and natural numbers. Here is the problem: Given a natural number N (1 ≤ N ≤ 10^6), determine how many prime numbers are l...	<think> Okay, I need to solve this problem where I have to find the number of prime numbers less than or equal to a given number N. Hmm, the problem statement says that N can be up to 1e6, which is a million. So, it's important that the algorithm I use is efficient enough to handle that size without taking too long. T...	[ { "from": "human", "value": "Sam loves to play with numbers. He recently learned about prime numbers and wanted to dive deeper into understanding their properties. He came up with an interesting problem involving prime numbers and natural numbers. Here is the problem:\n\nGiven a natural number N (1 ≤ N ≤ 10...
Barnyard Fun has a set of N barns arranged in a row, each with a certain number of cows in it. Each day, a random number generator is used to select a pair of barns and all the cows in those barns are swapped. The goal is to distribute the cows such that the total number of cows in the first half of the barns is as clo...	<think> Okay, so I've got this problem to solve where I need to minimize the difference between the sum of cows in the first half of barns and the second half after performing any number of swaps. Hmm. Let me think about it. First, I should understand the problem properly. The barns are arranged in a row, and any pair...	[ { "from": "human", "value": "Barnyard Fun has a set of N barns arranged in a row, each with a certain number of cows in it. Each day, a random number generator is used to select a pair of barns and all the cows in those barns are swapped. The goal is to distribute the cows such that the total number of cows...
How many non-attacking rooks can be placed on an n x n chessboard? Recall that a rook can attack another rook if they are on the same row or the same column. Only one rook may be placed on each square of the chessboard. Example 1: Input: n = 4 Output: 4 Explanation: We can place 4 non-attacking rooks on a 4x4 chessboa...	<think> Okay, I need to find out the maximum number of non-attacking rooks that can be placed on an n x n chessboard. Hmm, let's think about rooks. Rooks attack in rows and columns. So to place them without attacking each other, each rook must be in a unique row and a unique column. Wait, right. So for a standard 8x8 ...	[ { "from": "human", "value": "How many non-attacking rooks can be placed on an n x n chessboard? Recall that a rook can attack another rook if they are on the same row or the same column. Only one rook may be placed on each square of the chessboard.\n\nExample 1:\nInput:\nn = 4\nOutput:\n4\nExplanation:\nWe ...
As the CTO of a tech startup, you are tasked with implementing a secure message delivery system. The system uses a specific encoding scheme based on the Reverse-Polish Notation (RPN) for encrypting and decrypting messages. Each message is encoded into a mathematical expression written in RPN, and the decoded output is ...	<think> Okay, I have to solve this problem where I need to evaluate an RPN expression and return the integer result. Hmm, let's think about how to approach this. So RPN is Reverse Polish Notation, where the operators come after their operands. The standard way to evaluate RPN is using a stack. Right, I remember that. ...	[ { "from": "human", "value": "As the CTO of a tech startup, you are tasked with implementing a secure message delivery system. The system uses a specific encoding scheme based on the Reverse-Polish Notation (RPN) for encrypting and decrypting messages. Each message is encoded into a mathematical expression w...
Alex is a game enthusiast and loves to play strategic video games that involve collecting resources. One day, while playing his favorite game, he encountered a scenario where he was given a string of characters representing different types of resources. Each character in the string is either 'G' for gold, 'S' for silve...	<think> Okay, I need to solve this problem where I have to find the smallest segment in a string that contains all three resources: 'G', 'S', and 'C'. If it's not possible, I return 0. Let me think about how to approach this. So, the problem is similar to finding the smallest window substring that contains all charact...	[ { "from": "human", "value": "Alex is a game enthusiast and loves to play strategic video games that involve collecting resources. One day, while playing his favorite game, he encountered a scenario where he was given a string of characters representing different types of resources. Each character in the str...
Create a function that takes a list of integers and an integer K, and returns the maximum sum of a subarray with exactly K elements. If the list has fewer than K elements, return None. The subarray should be contiguous and the function needs to be efficient in terms of time complexity. EXAMPLES For the list `[2, 1, 5,...	<think> Okay, I need to create a Python function called max_subarray_sum that takes a list of integers and an integer K, and returns the maximum sum of a subarray with exactly K elements. Hmm, let's think about the steps. First, I should check if the length of the list is less than K. If it is, return None. That's str...	[ { "from": "human", "value": "Create a function that takes a list of integers and an integer K, and returns the maximum sum of a subarray with exactly K elements. If the list has fewer than K elements, return None. The subarray should be contiguous and the function needs to be efficient in terms of time comp...
An antique book collector wants to organize their collection of rare books. Each book in the collection has a certain thickness and monetary value. You have N books, each with a unique thickness T_i and a unique value V_i. The goal is to select a subset of books such that the total thickness of the selected books does...	<think> Okay, I've got this problem to solve. Let's see what it's about. So, the task is to help an antique book collector select a subset of books such that the total thickness doesn't exceed a certain limit, and the sum of their values is maximized. Hmm, sounds familiar. Oh right, it's similar to the classic knapsack...	[ { "from": "human", "value": "An antique book collector wants to organize their collection of rare books. Each book in the collection has a certain thickness and monetary value.\n\nYou have N books, each with a unique thickness T_i and a unique value V_i. The goal is to select a subset of books such that the...
You are given a string that contains letters and digits. The task is to reorder the string such that all letters come first, followed by all the digits. The relative ordering of the letters and digits should be preserved. -----Input----- The first line contains a single string s (1 ≤ \|s\| ≤ 1000), which contains lette...	<think> Okay, I need to solve this problem where I'm given a string of letters and digits, and I have to reorder it such that all letters come first, followed by all digits. Also, the relative order of the letters should be preserved among themselves, and the same for the digits. Hmm. So the input is a single string, ...	[ { "from": "human", "value": "You are given a string that contains letters and digits. The task is to reorder the string such that all letters come first, followed by all the digits. The relative ordering of the letters and digits should be preserved.\n\n-----Input-----\n\nThe first line contains a single st...
Maria loves to collect unique items. She has an initial collection of items represented as an array of integers. Each integer in the array represents a different item type. Maria wants to add a minimal number of new items to her collection so that she has exactly k unique items in total. Write a program to help Maria ...	<think> Okay, I need to solve this problem where Maria wants to add the minimal number of new items to her collection so that she has exactly k unique items. Let's break down the problem step by step. First, let's understand the input. We have two integers n and k. n is the number of items she currently has, and k is ...	[ { "from": "human", "value": "Maria loves to collect unique items. She has an initial collection of items represented as an array of integers. Each integer in the array represents a different item type. Maria wants to add a minimal number of new items to her collection so that she has exactly k unique items ...
You are given a grid of size N x M where each cell contains a digit from 1 to 9. You can perform the following operation multiple times: Choose any non-negative integer k, and all the digits in the grid that are greater than or equal to k will decrease by 1. Determine the minimum number of operations needed to make all...	<think> Okay, so I've got this problem to solve, and I'm a bit stuck but let me think through it. The problem is about a grid of digits, and I need to find the minimum number of operations to turn all digits into zero. Each operation is choosing a k, and then all digits >=k decrease by 1. Hmm, interesting. So, each o...	[ { "from": "human", "value": "You are given a grid of size N x M where each cell contains a digit from 1 to 9. You can perform the following operation multiple times: Choose any non-negative integer k, and all the digits in the grid that are greater than or equal to k will decrease by 1. Determine the minimu...
Given an integer N and an N x N matrix filled with zeroes and ones, determine the size of the largest '1'-square sub-matrix present in the matrix. A '1'-square sub-matrix is a square of '1's in the matrix where all border cells and all internal cells are '1'. Write a function `largest1Square(matrix: List[List[int]]) -...	<think> Okay, so I have this problem where I need to find the largest 1-square sub-matrix in a given N x N matrix. Hmm, let's see what that means. Oh right, a 1-square is a square filled entirely with 1s, including all borders and internals. So I need to find the biggest such square in terms of side length. Let me thi...	[ { "from": "human", "value": "Given an integer N and an N x N matrix filled with zeroes and ones, determine the size of the largest '1'-square sub-matrix present in the matrix. A '1'-square sub-matrix is a square of '1's in the matrix where all border cells and all internal cells are '1'.\n\nWrite a function...
There is a sequence of N integers. You need to determine whether it is possible to make the sequence non-decreasing by modifying at most one element. A sequence is non-decreasing if each element is not smaller than the previous one. -----Constraints----- - 1 \leq N \leq 100,000 - -10^9 \leq each integer in the sequ...	<think> Okay, so I need to solve this problem where I have to determine if a given sequence can be made non-decreasing by modifying at most one element. Hmm, let me think about how to approach this. First, what's a non-decreasing sequence? Oh right, each element is not smaller than the previous one. So, it's allowed t...	[ { "from": "human", "value": "There is a sequence of N integers. You need to determine whether it is possible to make the sequence non-decreasing by modifying at most one element. A sequence is non-decreasing if each element is not smaller than the previous one. \n\n-----Constraints-----\n - 1 \\leq N \\leq ...
# Definition A perfect square is an integer that is the square of some integer. In other words, it is the product of some integer with itself. ## For example: 25 is a perfect square because it is 5 * 5. 144 is a perfect square because it is 12 * 12. 7 is not a perfect square because there is no integer n such th...	<think> Okay, I need to solve this problem where I have to count the number of perfect squares in a given list of positive integers. Hmm, I remember a perfect square is a number that's the square of an integer. So, for example, 4 is 2 squared, and 9 is 3 squared. First, I should think about how to determine if a numbe...	[ { "from": "human", "value": "# Definition\n\nA perfect square is an integer that is the square of some integer. In other words, it is the product of some integer with itself.\n\n## For example: \n25 is a perfect square because it is 5 * 5.\n144 is a perfect square because it is 12 * 12.\n7 is not a perf...
#Remove Duplicates Write a function that removes duplicate consecutive characters from a string, replacing runs of duplicates with a single instance of the character. Return the new string with the duplicates removed. ##examples ``` input: 'aabbcc' result: 'abc' input: 'aaabbbccc' result: 'abc' input: 'ababab' res...	<think> Okay, I need to solve this problem where I have to remove consecutive duplicate characters from a string. So, the goal is to go through the string and make sure that any runs of the same character are reduced to just one instance. Let's think about how to approach this. Hmm, how do I detect consecutive duplica...	[ { "from": "human", "value": "#Remove Duplicates\n\nWrite a function that removes duplicate consecutive characters from a string, replacing runs of duplicates with a single instance of the character. Return the new string with the duplicates removed.\n\n##examples \n```\ninput: 'aabbcc'\nresult: 'abc'\n\ninp...
Given a string `s` consisting of only lowercase letters, return the lexicographically smallest subsequence of `s` that contains all the distinct characters of `s` exactly once. Example 1: Input: s = "bcabc" Output: "abc" Explanation: The subsequence "abc" can be formed by removing the first 'b' and the second 'c'. ...	<think> Okay, let's see. I need to find the lexicographically smallest subsequence of a given string s that contains all the distinct characters exactly once. Hmm, so the subsequence should have each unique character of s once, and it should be as small as possible in lex order. Wait, the key here is that it's a subse...	[ { "from": "human", "value": "Given a string `s` consisting of only lowercase letters, return the lexicographically smallest subsequence of `s` that contains all the distinct characters of `s` exactly once.\n\nExample 1:\nInput: \ns = \"bcabc\"\nOutput: \n\"abc\"\nExplanation:\nThe subsequence \"abc\" can be...
David is managing a warehouse with N shelves, each holding an inventory of items, initially set to 0. He receives Q requests to either add or remove a certain quantity of items on certain shelves. Each request is represented by four integers: t, a, b, and k. Here, t is the type of the operation (1 for adding and 2 for ...	<think> Okay, I need to solve this problem where David is managing a warehouse with N shelves, and there are Q requests to add or remove items. The goal is to calculate the total number of items after all requests. Hmm, let's see. The constraints are pretty tight. N can be up to 1e6 and Q up to 1e5. So, a naive approa...	[ { "from": "human", "value": "David is managing a warehouse with N shelves, each holding an inventory of items, initially set to 0. He receives Q requests to either add or remove a certain quantity of items on certain shelves. Each request is represented by four integers: t, a, b, and k. Here, t is the type ...
Given a list of integers, write a function to move all zeroes to the end of the list while maintaining the relative order of the non-zero elements. You must do this in-place without making a copy of the list. ```python move_zeroes([0, 1, 0, 3, 12]) ==> [1, 3, 12, 0, 0] move_zeroes([1, 0, 2, 0, 3, 4]) ==> [1, 2, 3, 4,...	<think> Okay, I need to solve this problem where I have to move all the zeroes in a list to the end while keeping the order of the non-zero elements. And I have to do this in-place, without making a copy of the list. Hmm. Wait, so in Python, when they say in-place, does that mean I can't create a new list? Like I have...	[ { "from": "human", "value": "Given a list of integers, write a function to move all zeroes to the end of the list while maintaining the relative order of the non-zero elements. You must do this in-place without making a copy of the list.\n\n```python\nmove_zeroes([0, 1, 0, 3, 12]) ==> [1, 3, 12, 0, 0]\n\nmo...
Given an integer array nums, the task is to find the longest consecutive elements sequence and return its length. The sequence must be made of consecutive integers in a sorted order (ascending). Example 1: Input: nums = [100, 4, 200, 1, 3, 2] Output: 4 Explanation: The longest consecutive sequence is [1, 2, 3, 4] and...	<think> Okay, I have to solve this problem where I need to find the longest consecutive sequence in an integer array. Hmm, let's think about how to approach this. So the examples given are helpful. The first example, [100,4,200,1,3,2], the longest is 1,2,3,4, length 4. That makes sense because each number is consecuti...	[ { "from": "human", "value": "Given an integer array nums, the task is to find the longest consecutive elements sequence and return its length. The sequence must be made of consecutive integers in a sorted order (ascending). \n\nExample 1:\nInput:\nnums = [100, 4, 200, 1, 3, 2]\nOutput:\n4\nExplanation:\nThe...
You are given two strings s1 and s2 of equal length. The task is to determine whether the strings are isomorphic to each other. Two strings s1 and s2 are isomorphic if the characters in s1 can be replaced to get s2, while preserving the order of characters. No two characters may map to the same character, but a charac...	<think> Okay, I need to determine if two given strings are isomorphic. Hmm, what does isomorphic mean exactly? Oh right, two strings are isomorphic if the characters in s1 can be replaced to get s2 while keeping the order. Also, the mapping has to be one-to-one, meaning no two different characters in s1 can map to the ...	[ { "from": "human", "value": "You are given two strings s1 and s2 of equal length. The task is to determine whether the strings are isomorphic to each other.\n\nTwo strings s1 and s2 are isomorphic if the characters in s1 can be replaced to get s2, while preserving the order of characters. No two characters ...
## Task A restaurant is trying to optimize their meal preparation time by organizing the sequence in which dishes should be cooked. Each dish has a specific preparation time, and some dishes need to be prepared before others due to ingredient availability. Given a list of dishes, their preparation times, and dependenci...	<think> Okay, so I've got this problem to solve. Let's read it carefully and understand what's needed. The problem is about determining the minimum total time needed to prepare all dishes in a restaurant, considering their dependencies. Each dish has a preparation time, and some dishes depend on others being prepared...	[ { "from": "human", "value": "## Task\nA restaurant is trying to optimize their meal preparation time by organizing the sequence in which dishes should be cooked. Each dish has a specific preparation time, and some dishes need to be prepared before others due to ingredient availability. Given a list of dishe...