View Code of Problem 131

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int ar[105][105];
int main(){
	int n,m;
	while(cin>>n>>m){
		memset(ar,0,sizeof(ar));
		int a,b;
		for(int i=0;i<m;i++){
			cin>>a>>b;
			ar[a][b]=1;
		}
		for(int i=1;i<=n;i++){
			for(int j=1;j<=n;j++){
				for(int k=1;k<=n;k++){
					if(ar[j][k]==1 && ar[i][j]==1){
						ar[i][k]=1;
					}
				}
			}
		}
		bool flag=true;
		for(int i=1;i<=n;i++){
			for(int j=1;j<=n;j++){
				if(ar[i][j]==1 &&ar[j][i]==1){
					flag=false;
				}
			}
		}
		if(flag==true){
			cout<<"RIGHT"<<endl;
		}
		else{
			cout<<"ERROR"<<endl;
		}
	}
}

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