Adding Spaces to a String LeetCode solution in C++

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class Solution {
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 public:
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  string addSpaces(string s, vector<int> &spaces) {
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    int i, n = spaces.size(), m = s.size(), j;
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    string ans = "";
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    i = 0;
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    j = 0;
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    // jth pointer for current index of spaces vector
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    // ith pointer for current index of our answer string
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    while (i < m) {
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      // if at our current index i is equals to spaces[j] which means we have
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      // space at this index,so we add space right here
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      if (j < n && i == spaces[j]) {
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        ans += " ";
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        j++;
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        // incrementing j to get next space index location
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      }
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      ans += s[i];
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      i++;
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    }
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    return ans;
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  }
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};