Leetcode 1380. Lucky numbers in the matrix (save the minimum number of each row and the maximum number of each column)

  Note that all numbers are different , So there is no need to use index to judge

class Solution {
public:
    vector<int> luckyNumbers (vector<vector<int>>& matrix) {
        int m = matrix.size(), n = matrix[0].size();
        vector<int> minRow(m, INT_MAX), maxCol(n);
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                minRow[i] = min(minRow[i], matrix[i][j]);
                maxCol[j] = max(maxCol[j], matrix[i][j]);
            }
        }
        vector<int> ans;
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                if (matrix[i][j] == minRow[i] && matrix[i][j] == maxCol[j]) {
                    ans.emplace_back(matrix[i][j]);
                }
            }
        }
        return ans;
    }
};