Lang:G++
Edit12345678910111213141516171819202122232425262728293031#include "iostream"#include "vector"using namespace std;vector<int>v[502];int t;int n, m,a,b;int visited[502];void dfs(int enter) {if (visited[enter])return;visited[enter] = 1;for (int i = 0; i < v[enter].size(); i++) {dfs(v[enter][i]);}}int main(){cin >> t;while (t--) {cin >> n >> m;int t;for(int i=0;i<m;i++) {cin >> a >> b;t = a;v[a].push_back(b);v[b].push_back(a);}dfs(t);bool ans = true;for (int i = 1; i <= n; i++) {