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public class SetMatrixZeroes {

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

if (matrix.length == 0) {

return;

}

int row = matrix.length, col = matrix[0].length;

boolean clearRow = false, clearCol = false;

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

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

clearRow = true;

break;

}

}

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

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

clearCol = true;

break;

}

}

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

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

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

matrix[0][j] = 0;

matrix[i][0] = 0;

}

}

}

// 注意这里是从1开始

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

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

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

matrix[j][i] = 0;

}

}

}

// 注意这里是从1开始

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

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

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

matrix[i][j] = 0;

}

}

}

if (clearRow) {

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

matrix[0][i] = 0;

}

}

if (clearCol) {

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

matrix[i][0] = 0;

}

}

}

}