Submission #640118

#	Time	Username	Problem	Language	Result	Execution time	Memory
640118		dant	Bosses (BOI16_bosses)	C++14	100 / 100	626 ms	652 KiB

bosses

#include <bits/stdc++.h>

using namespace std;

const int MAX = 5005 ;
int vis[MAX] ;
long long cost = 0;

vector< vector<int> >adj(MAX) ;

int n , cnt = 0 ;

void bfs(int src)
{
    queue< pair<int , int> >q ;
    q.push({src , 1}) ;
    vis[src] = 1 ;
    while(!q.empty())
    {
        pair<int , int>p = q.front() ;
        q.pop() ;
        cnt++ ;
        int node = p.first ;
        cost += (p.second * 1ll) ;
        for(auto &child : adj[node])
        {
            if(vis[child] == 1)
                continue ;
            vis[child] = 1 ;
            q.push({child , p.second+1}) ;
        }
    }
    return ;
}

int main()
{
    scanf("%d" , &n) ;
    for(int i = 1 ; i <= n ; ++i)
    {
        int m ;
        scanf("%d" , &m) ;
        while(m--)
        {
            int x ;
            scanf("%d" , &x) ;
            adj[x].push_back(i) ;
        }
    }
    long long ans = 1e18 ;
    for(int i = 1 ; i <= n ; ++i)
    {
        memset(vis , 0 , sizeof(vis)) ;
        cnt = 0 , cost = 0;
        bfs(i) ;
        if(cnt != n)
            continue;
        ans = min(ans , cost) ;
    }
    return printf("%lld" , ans) , 0 ;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     scanf("%d" , &n) ;
      |     ~~~~~^~~~~~~~~~~
bosses.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%d" , &m) ;
      |         ~~~~~^~~~~~~~~~~
bosses.cpp:46:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |             scanf("%d" , &x) ;
      |             ~~~~~^~~~~~~~~~~

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