Minimum Number of Operations to Move All Balls to Each Box LeetCode solution in C++

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class Solution {
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 public:
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  vector<int> minOperations(string boxes) {
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    int n = boxes.size();
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    vector<int> ans;
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    for (int i = 0; i < n; i++) {
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      int res = 0;
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      for (int j = 0; j < n; j++) {
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        if (boxes[j] == '1') {
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          res += abs(i - j);
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        }
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      }
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      ans.push_back(res);
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    }
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    return ans;
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  }
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};