# The Search a 2D Matrix Java solutions

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 from the left to the right.
• The first integer of each row was greater than the last integer of the previous row.

For example,

Consider the following matrix:

`[  [1,   3,  5,  7],  [Ten, One,],  [23, 30, 34, 50]]`

Given target = `3` , return `true` .

`1  Public classSolution {2      Public BooleanSearchmatrix (int[] Matrix,inttarget) {3         intm = matrix.length, n = matrix[0].length;4         if(m = = 0 | | n = = 0)return false;5         inti = m-1,j = 0;6          while(I >= 0 && J <N) {7             if(Matrix[i][j] = = target)return true;8             if(Matrix[i][j] > target) i--;9             ElseJ + +;Ten         } One         return false; A     } -}`

The matrix of the problem is also characteristic. Comparison topics:

Http://www.cnblogs.com/guoguolan/p/5620209.html

Solution Two: You can use binary search to do, but should not use the characteristics of the matrix to do fast.

The Search a 2D Matrix Java solutions

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