Submission #388248

#	Time	Username	Problem	Language	Result	Execution time	Memory
388248		cpp219	Bosses (BOI16_bosses)	C++14	100 / 100	753 ms	672 KiB

bosses

#pragma GCC optimization "Ofast"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 5000 + 6;
const ll lim = 3e5 + 6;
const ll inf = 1e16 + 7;
typedef pair<ll,ll> LL;
vector<ll> g[N];
ll n,k,x,d[N],was[N],ans = inf;

ll oper(ll root){
    ll res = 1,cnt = 1;
    memset(was,0,sizeof(was)); was[root] = 1;
    queue<ll> q; d[root] = 1; q.push(root);
    while(!q.empty()){
        ll u = q.front(); q.pop();
        for (auto i : g[u]){
            if (!was[i]){
                was[i] = 1; d[i] = d[u] + 1; res += d[i];
                q.push(i); cnt++;
            }
        }
    }
    //cout<<cnt; exit(0);
    if (cnt == n) return res;
    return inf;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "test"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n;
    for (ll i = 1;i <= n;i++){
        cin>>k;
        while(k--) cin>>x,g[x].push_back(i);
    }
    //cout<<oper(4); return 0;
    for (ll i = 1;i <= n;i++) ans = min(ans,oper(i));
    cout<<ans;
}

Compilation message (stderr)

bosses.cpp:1: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    1 | #pragma GCC optimization "Ofast"
      | 
bosses.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
bosses.cpp: In function 'int main()':
bosses.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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