Submission #107343

#	Time	Username	Problem	Language	Result	Execution time	Memory
107343		MohamedAhmed0	Bosses (BOI16_bosses)	C++14	67 / 100	1552 ms	768 KiB

bosses

#include <bits/stdc++.h>

using namespace std;

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

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

int n , cnt = 0 ;

void bfs(int src)
{
    queue<int>q ;
    q.push(src) ;
    vis[src] = 1 ;
    par[src] = 0 ;
    while(!q.empty())
    {
        int node = q.front() ;
        q.pop() ;
        cnt++ ;
        for(auto &child : adj[node])
        {
            if(vis[child] == 1)
                continue ;
            vis[child] = 1 ;
            par[child] = node ;
            q.push(child) ;
        }
    }
    return ;
}

void dfs(int node)
{
    for(auto &child : adj[node])
    {
        if(par[child] == node)
        {
            dfs(child) ;
            dp[node] += dp[child] ;
        }
    }
    dp[node]++;
    cost += dp[node] * 1ll;
    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)) ;
        memset(dp , 0 , sizeof(dp)) ;
        memset(par , 0 , sizeof(par)) ;
        cnt = 0 , cost = 0;
        bfs(i) ;
        if(cnt != n)
            continue;
        dfs(i) ;
        ans = min(ans , cost) ;
    }
    return printf("%lld" , ans) , 0 ;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:53:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d" , &n) ;
     ~~~~~^~~~~~~~~~~
bosses.cpp:57:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d" , &m) ;
         ~~~~~^~~~~~~~~~~
bosses.cpp:61:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d" , &x) ;
             ~~~~~^~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 0 / 33