Submission #6411258

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Source Code Expand

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for (int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
typedef vector<ll> vll;
typedef vector<vll> vvll;


int main()
{
    ll number_of_town;
    cin >> number_of_town;
    ll start, end;
    cin >> start >> end;
    ll hop;
    cin >> hop;
    vll vec(hop + 2);
    vec.at(0) = start;
    REP(i, hop) cin >> vec.at(i + 1);
    vec.at(hop + 1) = end;
    set<ll> kind(vec.begin(), vec.end());
    if (vec.size() == kind.size()) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}

Submission Info

Judge Result