Number of Lines To Write String LeetCode solution in C++

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class Solution {
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 public:
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  vector<int> numberOfLines(vector<int> &widths, string s) {
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    vector<int> ans(2);
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    int lines = 0;
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    int calc = 0;
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    int i = 0;
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    while (i < s.length()) {
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      calc = 0;
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      while (i < s.length() and calc <= 100) {
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        calc += widths[s[i] - 'a'];
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        i++;
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      }
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      if (calc > 100) {
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        i -= 1;
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        calc -= widths[s[i] - 'a'];
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      }
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      lines++;
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      // cout<<lines;
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    }
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    ans[0] = lines;
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    ans[1] = calc;
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    return ans;
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  }
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};