The example in the problem seems to be wrong.

  • 3
    Input: 6
    Output: 3
    Explanation: The first 6 elements of magical string S is "12211" and it contains three 1's, so return 3.

    Shouldn't it be first 5 elements (12211) instead of 6? Am I stupid?

  • 0

    You are correct, of course.

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