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solution073.cpp
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78 lines (68 loc) · 1.26 KB
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/**
* Set Matrix Zeroes
*
* cpselvis([email protected])
* September 25th, 2016
*/
#include<iostream>
#include<vector>
using namespace std;
class Solution {
public:
void setZeroes(vector<vector<int> >& matrix) {
if (matrix.empty()) return;
bool rowZero = false, columnZero = false; // Variable to record wether first row and first column has zero number.
for (int i = 0; i < matrix[0].size(); i ++)
{
if (matrix[0][i] == 0)
{
rowZero = true;
}
}
for (int i = 0; i < matrix.size(); i ++)
{
if (matrix[i][0] == 0)
{
columnZero = true;
}
}
for (int i = 1; i < matrix.size(); i ++)
{
for (int j = 1; j < matrix[0].size(); j ++)
{
if (matrix[i][j] == 0)
{
matrix[0][j] = 0;
matrix[i][0] = 0;
}
}
}
for (int i = 1; i < matrix.size(); i ++)
{
for (int j = 1; j < matrix[0].size(); j ++)
{
if (matrix[i][0] == 0 || matrix[0][j] == 0)
{
matrix[i][j] = 0;
}
}
}
if (rowZero)
{
for (int i = 0; i < matrix[0].size(); i ++)
{
matrix[0][i] = 0;
}
}
if (columnZero)
{
for (int i = 0; i < matrix.size(); i ++)
{
matrix[i][0] = 0;
}
}
}
};
int main(int argc, char **argv)
{
}