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0073-set-matrix-zeroes.java

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class Solution {

public void setZeroes(int[][] matrix) {

int rows = matrix.length;

int cols = matrix[0].length;

boolean firstRow = false;

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

if (matrix[i][j] == 0) {

matrix[0][j] = 0;

if (i == 0) {

firstRow = true;

} else {

matrix[i][0] = 0;

}

}

}

}

for (int i = 1; i < rows; i++) {

for (int j = 1; j < cols; j++) {

if (matrix[0][j] == 0 || matrix[i][0] == 0) {

matrix[i][j] = 0;

}

}

}

if (matrix[0][0] == 0) {

for (int i = 0; i < rows; i++) {

matrix[i][0] = 0;

}

}

if (firstRow) {

for (int j = 0; j < cols; j++) {

matrix[0][j] = 0;

}

}

}

}