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Commit99971b3

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author
applewjg
committed
SetMatrixZeroes
Change-Id: Id82c30a5eb860bd4dd0493ba7ae03a1ff247bc07
1 parent6e9cb18 commit99971b3

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‎SetMatrixZeroes.java

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/*
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Author: King, wangjingui@outlook.com
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Date: Dec 25, 2014
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Problem: Set Matrix Zeroes
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Difficulty: Medium
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Source: https://oj.leetcode.com/problems/set-matrix-zeroes/
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Notes:
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Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.
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Follow up:
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Did you use extra space?
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A straight forward solution using O(mn) space is probably a bad idea.
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A simple improvement uses O(m + n) space, but still not the best solution.
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Could you devise a constant space solution?
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Solution: Use first row and column as auxiliary spaces instead of newly allocating ones.
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*/
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publicclassSolution {
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publicvoidsetZeroes(int[][]matrix) {
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intm =matrix.length;
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if(m <=0)return;
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intn =matrix[0].length;
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booleanrow_has_zero =false;
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booleancol_has_zero =false;
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for(intj=0;j<n;j++){
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if(matrix[0][j]==0){
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row_has_zero =true;
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break;
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}
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}
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for(inti=0;i<m;i++){
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if(matrix[i][0]==0){
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col_has_zero =true;
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break;
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}
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}
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for(inti=0;i<m;i++){
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for(intj=0;j<n;j++){
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if(matrix[i][j]==0){
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matrix[0][j] =0;
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matrix[i][0] =0;
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}
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}
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}
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for (inti =1;i <m;i++)
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for (intj =1;j <n;j++)
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if (matrix[i][0] ==0 ||matrix[0][j] ==0)
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matrix[i][j] =0;
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if (row_has_zero)
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for (inti =0;i <n;i++)
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matrix[0][i] =0;
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if (col_has_zero)
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for (inti =0;i <m;i++)
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matrix[i][0]=0;
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}
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}

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