Submission #107353

#	Time	Username	Problem	Language	Result	Execution time	Memory
107353		MohamedAhmed0	Bosses (BOI16_bosses)	C++14	67 / 100	1561 ms	98748 KiB

bosses

#include <bits/stdc++.h>
 
using namespace std;

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

const int MAX = 5005 ;
int vis[MAX] , par[MAX][MAX] , can[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] = src ;
    par[src][src] = 0 ;
    while(!q.empty())
    {
        int node = q.front() ;
        q.pop() ;
        cnt++ ;
        for(auto &child : adj[node])
        {
            if(vis[child] == src)
                continue ;
            vis[child] = src ;
            par[src][child] = node ;
            q.push(child) ;
        }
    }
    return ;
}
 
int src ;
 
void dfs(int node)
{
    for(auto &child : adj[node])
    {
        if(par[src][child] == node)
        {
            dfs(child) ;
            dp[node] += dp[child] ;
        }
    }
    dp[node]++;
    cost += dp[node] * 1ll;
    return ;
}
 
int readint()
{
    char c ;
    c = getchar() ;
    while(true)
    {
        if(c >= '0' && c <= '9')
            break ;
        c = getchar() ;
    }
    int result = (c - '0') ;
    c = getchar() ;
    while(true)
    {
        if(c < '0' || c > '9')
            break ;
        result = result * 10 + (c - '0') ;
        c = getchar() ;
    }
    return result ;
}
 
int main()
{
    n = readint() ;
    for(int i = 1 ; i <= n ; ++i)
    {
        int m ;
        m = readint() ;
        while(m--)
        {
            int x ;
            x = readint() ;
            adj[x].push_back(i) ;
        }
    }
    long long ans = 1e18 ;
    for(int i = 1 ; i <= n ; ++i)
    {
        cnt = 0 ;
        bfs(i) ;
        if(cnt == n)
            can[i] = 1 ;
    }
    for(int i = 1 ; i <= n ; ++i)
    {
        if(can[i] == 0)
            continue ;
        memset(dp , 0 , sizeof(dp)) ;
        src = i ;
        cnt = 0 , cost = 0;
        dfs(i) ;
        ans = min(ans , cost) ;
    }
    return printf("%lld" , ans) , 0 ;
}

Compilation message (stderr)

bosses.cpp:6:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
bosses.cpp:7:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")

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