calculate-digit-sum-of-a-string.json

{
  "id": 2361,
  "name": "calculate-digit-sum-of-a-string",
  "difficulty": "Easy",
  "link": "https://leetcode.com/problems/calculate-digit-sum-of-a-string/",
  "date": "2022-04-10",
  "task_description": "You are given a string `s` consisting of digits and an integer `k`. A **round** can be completed if the length of `s` is greater than `k`. In one round, do the following: **Divide** `s` into **consecutive groups** of size `k` such that the first `k` characters are in the first group, the next `k` characters are in the second group, and so on. **Note** that the size of the last group can be smaller than `k`. **Replace** each group of `s` with a string representing the sum of all its digits. For example, `\"346\"` is replaced with `\"13\"` because `3 + 4 + 6 = 13`. **Merge** consecutive groups together to form a new string. If the length of the string is greater than `k`, repeat from step `1`. Return `s` _after all rounds have been completed_. **Example 1:** ``` **Input:** s = \"11111222223\", k = 3 **Output:** \"135\" **Explanation:** - For the first round, we divide s into groups of size 3: \"111\", \"112\", \"222\", and \"23\". ​​​​​Then we calculate the digit sum of each group: 1 + 1 + 1 = 3, 1 + 1 + 2 = 4, 2 + 2 + 2 = 6, and 2 + 3 = 5. So, s becomes \"3\" + \"4\" + \"6\" + \"5\" = \"3465\" after the first round. - For the second round, we divide s into \"346\" and \"5\". Then we calculate the digit sum of each group: 3 + 4 + 6 = 13, 5 = 5. So, s becomes \"13\" + \"5\" = \"135\" after second round. Now, s.length <= k, so we return \"135\" as the answer. ``` **Example 2:** ``` **Input:** s = \"00000000\", k = 3 **Output:** \"000\" **Explanation:** We divide s into \"000\", \"000\", and \"00\". Then we calculate the digit sum of each group: 0 + 0 + 0 = 0, 0 + 0 + 0 = 0, and 0 + 0 = 0. s becomes \"0\" + \"0\" + \"0\" = \"000\", whose length is equal to k, so we return \"000\". ``` **Constraints:** `1 <= s.length <= 100` `2 <= k <= 100` `s` consists of digits only.",
  "test_case": [
    {
      "label": "Example 1",
      "input": "s = \"11111222223\", k = 3",
      "output": "\"135\" "
    },
    {
      "label": "Example 2",
      "input": "s = \"00000000\", k = 3",
      "output": "\"000\" "
    }
  ],
  "constraints": [
    "1 <= s.length <= 100",
    "2 <= k <= 100",
    "s consists of digits only."
  ],
  "python_template": "class Solution(object):\n    def digitSum(self, s, k):\n        \"\"\"\n        :type s: str\n        :type k: int\n        :rtype: str\n        \"\"\"\n        ",
  "java_template": "class Solution {\n    public String digitSum(String s, int k) {\n        \n    }\n}",
  "metadata": {
    "func_name": "digitSum"
  }
}