Created
September 24, 2014 11:14
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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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public void setZeroes(int[][] matrix) { | |
boolean firstRow =false,firstCol=false; | |
for(int i=0;i<matrix.length;i++){ | |
if(matrix[i][0]==0){ | |
firstCol=true; | |
break; | |
} | |
} | |
for(int i=0;i<matrix[0].length;i++){ | |
if(matrix[0][i]==0){ | |
firstRow=true; | |
break; | |
} | |
} | |
for(int i=1;i<matrix.length;i++){ | |
for(int j=1;j<matrix[0].length;j++){ | |
if(matrix[i][j]==0){ | |
matrix[i][0]=0; | |
matrix[0][j]=0; | |
} | |
} | |
} | |
for(int i=1;i<matrix.length;i++){ | |
for(int j=1;j<matrix[0].length;j++){ | |
if( matrix[i][0]==0 || matrix[0][j]==0){ | |
matrix[i][j]=0; | |
} | |
} | |
} | |
if(firstCol){ | |
for(int i=0;i<matrix.length;i++){ | |
matrix[i][0]=0; | |
} | |
} | |
if(firstRow){ | |
for(int i=0;i<matrix[0].length;i++){ | |
matrix[0][i]=0; | |
} | |
} | |
} |
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