제출 #47755

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
47755		daniel_02	Bitaro’s Party (JOI18_bitaro)	C++17	0 / 100	5 ms	3080 KiB

bitaro

#include <bits/stdc++.h>

#define pb push_back
#define fr first
#define sc second

using namespace std;

const int N = 1e5 + 7;

priority_queue<pair<int, int>>q;
vector<pair<int, int>>g[N];
bool busy[N], us[N];
int mx;

void dfs(int v, int d = 0)
{
    if (!busy[v])
        mx = max(mx, d);

    if (us[v])return;

    us[v] = 1;

    for (int i = 0; i < g[v].size(); i++)
    {
        int to = g[v][i].fr;

        dfs(to, d + 1);
    }
}
main()
{
    int n, m, Q;

    cin >> n >> m >> Q;

    for (int i = 1; i <= m; i ++)
    {
        int u, v;

        scanf("%d%d", &u, &v);

        g[v].pb({u, 1});
    }

    while (Q--)
    {
        int t, k;

        scanf("%d%d", &t, &k);

        for (int i = 0; i < k; i++)
        {
            int a;
            scanf("%d", &a);
            busy[a] = 1;
        }

        dfs(t);

        if (mx == 0)
        {
            if (busy[t])
            {
                cout << -1 << endl;
                continue;
            }
            cout << 0 << endl;
            continue;
        }
        cout << mx << endl;
        memset(us, 0, sizeof(us));
        memset(busy, 0, sizeof(busy));
        mx = 0;
    }
}

컴파일 시 표준 에러 (stderr) 메시지

bitaro.cpp: In function 'void dfs(int, int)':
bitaro.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < g[v].size(); i++)
                     ~~^~~~~~~~~~~~~
bitaro.cpp: At global scope:
bitaro.cpp:32:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
bitaro.cpp: In function 'int main()':
bitaro.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~
bitaro.cpp:51:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &t, &k);
         ~~~~~^~~~~~~~~~~~~~~~
bitaro.cpp:56:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a);
             ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86