排好序的二维数组, 从上到下从左到右增大, 给出一个数找出此数组里有多少个这个数. 不用两个循环做, 着手于条件(从左下角开始,若相等往右上跳一个,若小于target往右边跳一个,若大于target往上面跳一个, 若从右上角开始同理 ): public int searchMatrix(int[][] matrix, int target) { if(matrix == null){ ; } ; ; ; && j < matrix[i].length){ if(matrix[i][j…

1. 设查找的数位y,第一行最后一列的数位x 如果x<y,x是第一行最大的,所以第一行都小于y,删除第一行: 如果x>y,x是最后一列最小的,所以最后一列都大于y,删除最后一列: 这样保证x永远在可能有解的矩阵的第一行,最后一列. 时间复杂度:O(m+n) class Solution { public: /** * @param matrix, a list of lists of integers * @param target, an integer * @return a boolea…

Write an efficient algorithm that searches for a value in an m x n matrix, return the occurrence of it. This matrix has the following properties: Integers in each row are sorted from left to right. Integers in each column are sorted from up to bottom…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted in ascending from left to right. Integers in each column are sorted in ascending from top to bottom.…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from left to right. The first integer of each row is greater than the last integer of the previous ro…

Search a 2D Matrix Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from left to right. The first integer of each row is greater than the last integer…

Search a 2D Matrix Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from left to right. The first integer of each row is greater than the last integer…

11.6 Given an M x N matrix in which each row and each column is sorted in ascending order, write a method to find an element. LeetCode上的原题,请参见我之前的博客Search a 2D Matrix 搜索一个二维矩阵和Search a 2D Matrix II 搜索一个二维矩阵之二. class Solution { public: bool findElemen…

Search a 2D Matrix II Write an efficient algorithm that searches for a value in an m x n matrix, return the occurrence of it. This matrix has the following properties: Integers in each row are sorted from left to right. Integers in each column are so…

原题链接在这里:https://leetcode.com/problems/search-a-2d-matrix-ii/ Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted in ascending from left to right. Integer…