Submission #397164

#	Time	Username	Problem	Language	Result	Execution time	Memory
397164		giorgikob	Bosses (BOI16_bosses)	C++14	100 / 100	844 ms	24032 KiB

bosses

#include<bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define pb push_back
using namespace std;

const int N = 1e6+50, mod = 1e9+7, K = 31;

int n,k,x;
ll answer,res;
vector<int>gr[N];
bool fix[N];
int cnt = 0;

void bfs(int x){

    queue<pair<int,int>>q;
    q.push({x,1});
    fix[x] = 1;

    while(q.size()){
        auto p = q.front();
        q.pop();
        int x = p.ff;
        int h = p.ss;
        cnt++;
        res += h;
        for(auto to : gr[x]){
            if(fix[to]) continue;
            q.push({to,h+1});
            fix[to] = 1;
        }
    }
}

inline void test_case(){
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> k;
        for(int j = 1; j <= k; j++){
            cin >> x;
            //v[i].pb(x);
            gr[x].pb(i);
        }
    }

    ll answer = 1e18;
    for(int i = 1; i <= n; i++){
        bfs(i);
        if(cnt == n)answer = min(answer, res);
        res = 0;
        cnt = 0;
        for(int j = 1; j <= n; j++) fix[j] = 0;
    }

    cout << answer << endl;
}
 main(){
    ios::sync_with_stdio(0);

    int T = 1;
    //cin >> T;
    for(int i = 1; i <= T; i++){
        test_case();
    }
}

Compilation message (stderr)

bosses.cpp:59:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   59 |  main(){
      |       ^

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