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MaximalSquare.cpp
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MaximalSquare.cpp
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class Solution {
public:
int maximalSquare(vector<vector<char>>& matrix) {
int n=matrix.size();
if(n==0) return 0;
int m=matrix[0].size();
if(n==0 or m==0) return 0;
int v[n][m];
for(int i=0;i<n;i++){
if(matrix[i][0]=='0') v[i][0]=0;
else v[i][0]=1;
}
for(int i=0;i<m;i++){
if(matrix[0][i]=='0') v[0][i]=0;
else v[0][i]=1;
}
for(int i=1;i<n;i++){
for(int j=1;j<m;j++){
if(matrix[i][j]=='1'){
v[i][j]=min(v[i][j-1],min(v[i-1][j],v[i-1][j-1]))+1;
}
else v[i][j]=0;
}
}
int maxx=INT_MIN;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++)
if(maxx<v[i][j])
maxx=v[i][j];
}
if(maxx==1) return maxx;
return maxx*maxx;
}
};