#include

#include<bits/stdc++.h>

using namespace std;

int main() {

// your code goes here

ios_base::sync_with_stdio(false);

cin.tie(NULL);

int n,m;

cin>>n>>m;

int a[n+1][m+1];

string s="";

for(int i=1;i<=n;i++)

{

cin>>s;

for(int j=1;j<=m;j++)

a[i][j]=s[j-1]-48;

}

int q;

cin>>q;

for(int z=0;z<q;z++)

{

int x1=0,x2=0,y1=0,y2=0;

cin>>x1>>y1>>x2>>y2;

for(int i=x1;i<=x2;i++)

for(int j=y1;j<=y2;j++)

{

if(a[i][j]==0)

a[i][j]=1;

else

a[i][j]=0;

}

}

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

for(int j=1;j<=m;j++)

{

cout<<a[i][j];

}

cout<<endl;

}

return 0;

}

Please do help why is this TLE, but similar programs of others were accepted.