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LeetCode--Set Matrix Zeroes
Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.
click to show follow up.
Follow up:
Did you use extra space?
A straight forward solution using O(mn) space is probably a bad idea.
A simple improvement uses O(m + n) space, but still not the best solution.
Could you devise a constant space solution?
Solution:
class Solution
{
public:
void setZeroes(vector<vector<int> > &matrix)
{
int n = matrix.size();
if(n == 0)
return;
int m = matrix[0].size();
if(m == 0)
return;
bool* flag_row = new bool[n];
for(int i=0; i<n; i++)
flag_row[i] = false;
bool* flag_col = new bool[m];
for(int i=0; i<m; i++)
flag_col[i] = false;
for(int i=0; i<n; i++)
{
for(int j=0; j<m; j++)
{
if(matrix[i][j] == 0)
{
flag_row[i] = true;
flag_col[j] = true;
}
}
}
for(int i=0; i<n; i++)
{
if(flag_row[i] == true)
{
for(int j=0; j<m; j++)
matrix[i][j] = 0;
}
}
for(int i=0; i<m; i++)
{
if(flag_col[i] == true)
{
for(int j=0; j<n; j++)
matrix[j][i] = 0;
}
}
return ;
}
};LeetCode--Set Matrix Zeroes
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