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【简答题】
给定一个m×n的数值矩阵A，如果矩阵A中存在这样的一个元素A[i][j]满足条件：A[i][j]是第i行中值最小的元素，且又是第j列中值最大的元素，则称之为该矩阵的一个马鞍点。编写一个方法计算出m*n的矩阵A的所有马鞍点。
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