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编写一个高效的算法来判断 m x n 矩阵中,是否存在一个目标值。该矩阵具有如下特性:
示例 1:

输入: matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 3
输出: true
示例 2:

输入: matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 13
输出: false
提示:
m == matrix.lengthn == matrix[i].length1 <= m, n <= 100-104 <= matrix[i][j], target <= 104/**
* @param {number[][]} matrix
* @param {number} target
* @return {boolean}
*/
var searchMatrix = function(matrix, target) {
};
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