Astralis session I

input/code.cpp: In function 'int BFS(std::vector<std::vector<int> >&, std::vector<bool>&, int)':
input/code.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for(int i=0; i<roads[x].size(); i++){
      |                      ~^~~~~~~~~~~~~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:42:28: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare]
   42 |     for(unsigned int i=0; i<(n-1); i++){
      |                           ~^~~~~~
input/code.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for(int i=0; i< edges.size(); i++){
      |                  ~^~~~~~~~~~~~~~
input/code.cpp:81:23: warning: comparison of integer expressions of different signedn...

#include <iostream>
#include <vector>
#include <queue>


using namespace std;


int BFS(vector<vector<int>>& roads, vector<bool>& visited, int ini){
    queue<int> q;
 
    q.push(ini);
    int count = 0;
    
 
    while(not q.empty())
    {
        int x = q.front();
        visited[x]=true;
        count += 1;

        q.pop();
        for(int i=0; i<roads[x].size(); i++){
            if(roads[x][i]==true and not visited[i]){
                q.push(i);
            }
        }
    }

    //cout<<count<<endl;
    return count;
}


int main(){
    int n;
    cin >> n;
    vector<vector<int>> roads(n, vector<int>(n,false));

    vector<pair<int,int>> edges(n-1);
 
    for(unsigned int i=0; i<(n-1); i++){
        int a,b;
        cin >> a >> b;
        roads[a-1][b-1]=true;
        roads[b-1][a-1]=true;
        edges[i] = make_pair(a-1,b-1);
    }

    vector<bool> visited(n,false);

    bool sol=false;

    for(int i=0; i< edges.size(); i++){
        //cout<<i<<endl;
        int x = edges[i].first;
        int y = edges[i].second;

        roads[x][y]=false;
        roads[y][x]=false;

        visited = vector<bool>(n,false);

        int a = BFS(roads, visited, x);

        if(a == n/2){
            //cout<<"hola"<<endl;
            visited = vector<bool>(n,false);
            int b = BFS(roads, visited, x);
            if(b == n/2){
                sol = true;
                break;
            }
        }
        roads[x][y]=true;
        roads[y][x]=true;
    }

    if(sol){
        cout<<"YES"<<endl;
        for(int i=0; i< visited.size(); i++){
            if(visited[i]==false){
                cout <<'M';
            }
            else cout << 'U';
        }
    }
    else cout << "NO" << endl;

    

}

Test 1

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Test 2

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Test 43

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Test 48

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Test 60

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Test 61

Verdict: RUNTIME ERROR