提出 #27359912

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ソースコード 拡げる

#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <deque>
#include <algorithm>
#include <math.h>
#include <climits>
typedef long long LL;
using namespace std;

int main()
{
    LL N = 0u;
    cin >> N;
    LL X = 0u;
    cin >> X;
    vector<LL> A;
    for (LL i = 0ULL; i < N; ++i)
    {
        LL a = 0u;
        cin >> a;
        A.emplace_back(a-1);
    }

    set<LL> knowsSecret;
    knowsSecret.insert(X-1);
    LL result = 0u;
    LL current = X-1;
    while (true)
    {
        if (knowsSecret.find(A[current]) == knowsSecret.end())
        {
            knowsSecret.insert(A[current]);
            current = A[current];
        }
        else
        {
            break;
        }
    }
    cout << knowsSecret.size() << endl;
}

提出情報

コンパイルエラー

./Main.cpp: In function ‘int main()’:
./Main.cpp:29:8: warning: unused variable ‘result’ [-Wunused-variable]
   29 |     LL result = 0u;
      |        ^~~~~~

ジャッジ結果