{ "data": { "question": { "questionId": "2361", "questionFrontendId": "2243", "boundTopicId": null, "title": "Calculate Digit Sum of a String", "titleSlug": "calculate-digit-sum-of-a-string", "content": "

You are given a string s consisting of digits and an integer k.

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A round can be completed if the length of s is greater than k. In one round, do the following:

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    \n\t
  1. 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.
    2. \n\t
  2. 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.
    3. \n\t
  3. Merge consecutive groups together to form a new string. If the length of the string is greater than k, repeat from step 1.
    4. \n
\n\n

Return s after all rounds have been completed.

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Example 1:

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\nInput: s = "11111222223", k = 3\nOutput: "135"\nExplanation: \n- For the first round, we divide s into groups of size 3: "111", "112", "222", and "23".\n  ​​​​​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. \n  So, s becomes "3" + "4" + "6" + "5" = "3465" after the first round.\n- For the second round, we divide s into "346" and "5".\n  Then we calculate the digit sum of each group: 3 + 4 + 6 = 13, 5 = 5. \n  So, s becomes "13" + "5" = "135" after second round. \nNow, s.length <= k, so we return "135" as the answer.\n
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Example 2:

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\nInput: s = "00000000", k = 3\nOutput: "000"\nExplanation: \nWe divide s into "000", "000", and "00".\nThen we calculate the digit sum of each group: 0 + 0 + 0 = 0, 0 + 0 + 0 = 0, and 0 + 0 = 0. \ns becomes "0" + "0" + "0" = "000", whose length is equal to k, so we return "000".\n
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Constraints:

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