解：

#include<iostream>
#include<vector>
using namespace std;
int main(){
    int n;cin>>n;
    vector<vector<int>> grid(n,vector<int>(n));
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)
            cin>>grid[i][j];
    int count=0;
    for(int i=0;i<n;i++){
        int sum=0;
        for(int j=0;j<n;j++)sum+=grid[i][j];
        if(sum%2!=0)count++;
    }
    for(int j=0;j<n;j++){
        int sum=0;
        for(int i=0;i<n;i++)sum+=grid[i][j];
        if(sum%2!=0)count++;
    }
    int diag1=0,diag2=0;
    for(int i=0;i<n;i++){
        diag1+=grid[i][i];
        diag2+=grid[i][n-1-i];
    }
    if(diag1%2!=0)count++;
    if(diag2%2!=0)count++;
    cout<<count<<endl;
    return 0;
}

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