gistfile1.txt

#include <bits/stdc++.h>using namespace std;
char px[1000][1001];int n;
bool issymmetry();void diff(int,int);
int main(void){    int c,count=0;    cin >> c >> n;    for(int i=0;i<n;i++)        cin >> px[i];            for(int i=0;i<c;i++){        int d;        cin >> d;        for(int j=0;j<d && i!=0;j++){            int x,y;            cin >> y >> x;            px[y-1][x-1] = (px[y-1][x-1]=='0')?'1':'0';        }        count+=issymmetry();    }    cout << count << endl;}
bool issymmetry(){    for(int i=0;i<n;i++){        for(int j=0;j<n;j++){            if(px[i][j]!=px[i][(n-1)-j])                return false;            if(px[(n-1)-i][j]!=px[i][j])                return false;        }    }    return true;}