Peli

input/code.cpp: In function 'void solve(Node)':
input/code.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         for(int i=0;i<to[u].size();i++){
      |                     ~^~~~~~~~~~~~~

#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<vector>
#include<queue>

using namespace std;

typedef long long ll;
typedef long double ld;

vector<ll>to[100009];
ll n,m;

struct Node{
    int pos;
    int stp;
    int ed;
    int tot;
    int qid;
};

ll Q;
ll qS[100009];
ll qE[100009];
ll qC[100009];
bool ans[100009];
bool mark[100009];

queue<Node>q;
void solve(Node tmp){
    q.push(tmp);
    while(!q.empty()){
        Node now=q.front();
        q.pop();
        if(mark[now.qid]){
            continue;
        }
        int u=now.pos;
        if(now.stp==now.tot){
            if(u==now.ed){
                ans[now.qid]=true;
                mark[now.qid]=true;
            }
            continue;
        }
        for(int i=0;i<to[u].size();i++){
            int v=to[u][i];
            Node nxt;
            nxt.ed=now.ed;
            nxt.qid=now.qid;
            nxt.tot=now.tot;
            nxt.pos=v;
            nxt.stp=now.stp+1;
            q.push(nxt);
        }
    }
}

int main(){
    cin>>n>>m>>Q;
    for(ll i=1;i<=m;i++){
        ll u,v;
        cin>>u>>v;
        to[u].push_back(v);
        to[v].push_back(u);
    }

    for(ll i=1;i<=Q;i++){
        cin>>qS[i]>>qE[i]>>qC[i];
        Node tmp;
        tmp.pos=qS[i];
        tmp.ed=qE[i];
        tmp.stp=0;
        tmp.tot=qC[i];
        tmp.qid=i;
        solve(tmp);
        if(ans[i])cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
        
    }

    return 0;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: RUNTIME ERROR

Test 3

Group: 2

Verdict: RUNTIME ERROR

Test 4

Group: 1, 2

Verdict: RUNTIME ERROR

Test 5

Group: 1, 2

Verdict: RUNTIME ERROR

Test 6

Group: 2

Verdict: RUNTIME ERROR

Test 7

Group: 2

Verdict: RUNTIME ERROR

Test 8

Group: 1, 2

Verdict: RUNTIME ERROR

Test 9

Group: 2

Verdict: RUNTIME ERROR

Test 10

Group: 2

Verdict: RUNTIME ERROR