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Set Matrix Zeroes.cpp
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Set Matrix Zeroes.cpp
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class Solution {
public:
void setZeroes(vector<vector<int> > &matrix) {
bool firstR = false, firstC = false;
int N = matrix.size();
if (N == 0) return;
int M = matrix[0].size();
for (int i = 0; i < N; i++) {
for (int j = 0; j < M; j++) {
if (matrix[i][j] == 0) {
matrix[i][0] = 0;
matrix[0][j] = 0;
if (i == 0) firstR = true;
if (j == 0) firstC = true;
}
}
}
for (int i = 1; i < N; i++) {
for (int j = 1; j < M; j++) {
if (matrix[0][j] == 0 || matrix[i][0] == 0) {
matrix[i][j] = 0;
}
}
}
if (firstR) {
for (int i = 0; i < M; i++) {
matrix[0][i] = 0;
}
}
if (firstC) {
for (int i = 0; i < N; i++) {
matrix[i][0] = 0;
}
}
}
};