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hoaithu.melody - C++, pasted on Jun 26:
// Catan

#include <iostream>
using namespace std;

int TC, M, N; 
int x, y;
int matrix[26][26], visit[26][26];

int maxxx;

void backtrack(int x, int t){
	for(int i=0; i<N; i++){
		if(matrix[x][i]==1){
			if(visit[i][x]==0){
				visit[i][x]=visit[x][i]=1;
				backtrack(i, t+1);
				visit[i][x]=visit[x][i]=0;
			}
		}
	}
	if(t>maxxx) maxxx=t;
}



int main(){
	//freopen("in.txt","r",stdin);
	cin>> TC;
	for(int t=1; t<=TC; t++){
		int r=-1;
		int l=-1;
		cin>>N>>M;
		for(int i=0; i<N; i++){
			
			for(int j=0; j<N; j++){
				matrix[i][j]=0;
				visit[i][j]=0;
			}
		}
		for(int i=0; i<M; i++){
			cin>>x>>y;
			matrix[x][y]=matrix[y][x]=1;
		}
		
		maxxx=0;
		int so=0;
		while(so<N){
			backtrack(so, 0);
			so++;
		}
		cout<< maxxx<< endl;
	}
	return 0;
}


Output:
No errors or program output.


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