# Search a 2D Matrix II

Source: Internet
Author: User

Write an efficient algorithm, searches for a value in a m x n Matrix. This matrix has the following properties:

• Integers in each row is sorted in ascending from left to right.
• Integers in each column is sorted in ascending from top to bottom.

For example,

Consider the following matrix:

`[  [1,   4,  7, one, a],  [2,   5, 8,, +  ],  [3,   6,  9, +, +],  [10, 13, 14, 17,  [18, 21, 23, 26, 30]`

Given target = `5` , return `true` .

Given target = `20` , return `false` .

`1Solution 1. Binary Search2 //The matrix is divided into 3 parts:smaller, bigger and unknown.3  Public classSolution {4      Public BooleanSearchmatrix (int[] Matrix,inttarget) {5         intm =matrix.length;6         intn = matrix[0].length;7         inti = 0, j = n-1;8          while(I<m && j>=0) {9             if(target = = Matrix[i][j])return true;Ten             if(Matrix[i][j] >target) { Onej--; A}Else if(Matrix[i][j] <target) { -i++; -             } the         } -          -         return false; -     } +}`

Search a 2D Matrix II

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