Submission #1166413

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166413		son2008	Bosses (BOI16_bosses)	C++20	100 / 100	376 ms	740 KiB

bosses

#include<bits/stdc++.h>
using namespace std;
#define task "task"
#define ii pair<int,int>
#define fi first
#define se second
//#define int long long
#define ll long long
#define ld double
#define mp make_pair
#define lg2 30
#define iii pair<int,ii>
#define iiii pair<ii,ii>
#define base 29
#define eps 1e-8
int dx[]= {0LL,0LL,1,-1,1,1,-1,-1};
int dy[]= {1,-1,0LL,0LL,1,-1,1,-1};
const int maxn=5e3+1;
const int mod=1e9+7;
int n,a[maxn],m,k,dist[maxn];
vector<int>e[maxn];
void init()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        int k;
        cin>>k;
        while(k--)
        {
            int x;
            cin>>x;
            e[x].push_back(i);
        }
    }
}
void process()
{
    ll ans=1e18;
    for(int r=1;r<=n;r++)
    {
        memset(dist,0,sizeof(dist));
        dist[r]=1;
        queue<int>q;
        q.push(r);
        while(!q.empty())
        {
            int u=q.front();
            q.pop();
            for(int v:e[u])
            {
                if(!dist[v])
                {
                    dist[v]=dist[u]+1;
                    q.push(v);
                }
            }
        }
        ll tmp=0;
        bool ok=true;
        for(int i=1;i<=n;i++)
        {
            if(!dist[i])ok=false;
            tmp+=1LL*dist[i];
        }
        if(ok)ans=min(ans,tmp);
    }
    cout<<ans;
}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if(fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    init();
    process();
    cerr <<endl<< "TIME : " << clock() * 0.001 << "s" << endl ;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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