Count Negative Numbers in a Sorted Matrix LeetCode solution in C++

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class Solution {
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 public:
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  int countNegatives(vector<vector<int>> &grid) {
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    int ans = 0;
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    for (auto hehe : grid)
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      for (int i : hehe)
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        if (i < 0) ans++;
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    return ans;
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  }
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};