Wierd Runtime Error for [1, 0]

  • 0

    First I check if the last digit is 9. In this test case, it is not, so it should just increment the 0 by 1 and end the program. I don't why leetcode says I have runntime error. I also tried this problem in visual studio without any runtime issue. Can someone please help me? Thanks
    vector<int> plusOne(vector<int>& digits) {
    int s = digits.size();
    if (digits.back() == 9){
    digits.back() = 0;
    digits[s - 2]++;
    int i = 2;
    while(digits[s -i] == 0){
    digits[s - (++i)]++;
    return digits;

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