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class Solution {

public boolean findNumberIn2DArray(int[][] matrix, int target) {

if (matrix == null || matrix.length == 0 || matrix[0].length == 0)

return false;

int rows = matrix.length, cols = matrix[0].length;

int r = 0, c = cols - 1; // 从右上角开始

while (r <= rows - 1 && c >= 0) {

if (target == matrix[r][c])

return true;

else if (target > matrix[r][c])

r++;

else

c--;

}

return false;

}

}