Check if Matrix Is X-Matrix LeetCode solution in C++

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class Solution {
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 public:
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  bool checkXMatrix(vector<vector<int>> &grid) {
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    int n = grid.size();
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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 (i == j or i == n - j - 1) {
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          if (!grid[i][j]) return false;
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        } else if (grid[i][j])
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          return false;
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      }
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    }
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    return true;
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  }
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};