How to find the sort Matrix in LeetCode

Today, I will talk to you about how to find the sorting matrix in LeetCode. Many people may not know much about it. In order to let everyone know more, Xiaobian summarized the following contents for everyone. I hope you can gain something according to this article.

1. Brief description of the problem

Given an M×N matrix, where each row and column is arranged in ascending order, write code to find an element.

2, example

Examples:

The existing matrix is as follows:

[ [1, 4, 7, 11, 15], [2, 5, 8, 12, 19], [3, 6, 9, 16, 22], [10, 13, 14, 17, 24], [18, 21, 23, 26, 30]] Given target = 5, returns true.

Given target = 20, returns false.

3, the solution to the problem

Normal solutions.

4, the solution program

public class SearchMatrixTest2 { public static void main(String[] args) { int[][] matrix = { {1, 4, 7, 11, 15}, {2, 5, 8, 12, 19}, {3, 6, 9, 16, 22}, {10, 13, 14, 17, 24}, {18, 21, 23, 26, 30} }; int target = 5; boolean searchMatrix = searchMatrix(matrix, target); System.out.println("searchMatrix = " + searchMatrix); }

public static boolean searchMatrix(int[][] matrix, int target) { if (matrix == null || matrix.length == 0 || matrix[0].length == 0) { return false; } int rowLength = 0; int colLength = matrix[0].length - 1; while (rowLength

= 0) { if (matrix[rowLength][colLength] == target) { return true; } else if (matrix[rowLength][colLength] > target) { colLength--; } else { rowLength++; } } return false; }}

5, the solution program picture version

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