Peli

input/code.cpp: In function 'int main()':
input/code.cpp:43:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   43 |             auto [u, v] = q.front(); q.pop();
      |                  ^

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector <ll> vl;
typedef vector <vl> vvl;
typedef pair <ll, ll> pl;

const ll inf = 1e18;

#define fi first
#define se second
#define pb push_back

void out(const vl &a)
{
    for(auto x : a)
        cerr << x << " ";
    cerr << "\n";
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    ll n, m, i, j, qu;
    cin >> n >> m >> qu;
    vvl g(n + 1);
    vector <vvl> ans(2, vvl(n + 1, vl(n + 1, inf)));
    queue <pl> q;
    while(m--)
    {
        cin >> i >> j;
        g[i].pb(j);
        g[j].pb(i);
    }
    for(i = 1; i <= n; i++)
    {
        ans[0][i][i] = 0;
        q.push({0, i});
        while(!q.empty())
        {
            auto [u, v] = q.front(); q.pop();
            u = -u + 1;
            for(auto x : g[v])
            {
                if(ans[u % 2][i][x] > u)
                {
                    ans[u % 2][i][x] = u;
                    q.push({-u, x});
                }
            }
        }
    }

    /*for(auto x : ans[0])
        out(x);
    cerr << "\n";
    for(auto x : ans[1])
        out(x);
    cerr << "\n";*/

    while(qu--)
    {
        cin >> i >> j >> m;
        if(ans[m % 2][i][j] <= m)
            //if((m - ans[m % 2][i][j]) % 2)
              //  cout << "NO\n";
            //else
                cout << "YES\n";
        else
            cout << "NO\n";
    }
    return 0;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 1, 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED