Flipping an Image LeetCode solution in C++

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class Solution {
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 public:
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  vector<vector<int>> flipAndInvertImage(vector<vector<int>> &image) {
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    int n = image.size();
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    vector<int> ans;
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    for (int i = 0; i < image.size(); i++) {
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      ans = image[i];
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      reverse(ans.begin(), ans.end());
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      image[i] = ans;
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    }
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    for (int i = 0; i < n; i++) {
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      for (int j = 0; j < n; j++) {
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        if (image[i][j] == 0) {
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          image[i][j] = 1;
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        } else {
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          image[i][j] = 0;
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        }
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      }
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    }
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    return image;
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  }
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};