Submission #706411

#	Time	Username	Problem	Language	Result	Execution time	Memory
706411		Alihan_8	Bosses (BOI16_bosses)	C++17	100 / 100	625 ms	708 KiB

bosses

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n; cin >> n;
    vector <int> g[n];
    for ( int i = 0; i < n; i++ ){
        int x; cin >> x;
        while ( x-- ){
            int t; cin >> t;
            g[--t].pb(i);
        }
    }
    const int inf = 1e18;
    auto bfs = [&](int st){
        vector <int> dis(n, -1);
        dis[st] = 1;
        queue <int> q; q.push(st);
        while ( !q.empty() ){
            int cur = q.front();
            q.pop();
            for ( auto to: g[cur] ){
                if ( dis[to] != -1 ) continue;
                dis[to] = dis[cur]+1;
                q.push(to);
            }
        }
        int cnt = 0;
        for ( auto i: dis ){
            cnt += i;
            if ( i == -1 ) return inf;
        }
        return cnt;
    };
    int Mn = inf;
    for ( int i = 0; i < n; i++ ){
        Mn = min(Mn, bfs(i));
    }
    cout << Mn;

    cout << '\n';
}

Compilation message (stderr)

bosses.cpp: In function 'void IO(std::string)':
bosses.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33