题解

   #include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
	cin >> n;
	char a[n][n];
	
	for(int i=0;i<n;i++){
		string s;
		cin >> s;
		
		for(int j=0;j<s.size();j++)
			a[i][j]=s[j];				
	}
	int err =0;
	for(int i=0;i<n;i++){
		for (int j=0;j<n;j++ ){
			if(i==j){
				if(a[i][j]!='-')err++;
			}else if(a[i][j]=='D'){
				if(a[j][i]!='D')err++;
				
			}else if(a[i][j]==a[j][i])
				err++;
			
				
			
		}
	}
	if(err>0)
		cout << "incorrect";
	else
		cout <<"correct";
	return 0;
}