Submission #320688

#	Time	Username	Problem	Language	Result	Execution time	Memory
320688		zaneyu	Bosses (BOI16_bosses)	C++14	100 / 100	739 ms	748 KiB

bosses

/*input
4
1 4
3 1 3 4
2 1 2
1 3
*/
//#include "potatoqueue.h"
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<long long, null_type, less_equal<long long>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
#pragma GCC optimize("unroll-loops,no-stack-protector")
//order_of_key #of elements less than x
// find_by_order kth element
typedef long long int ll;
#define ld double
#define pii pair<ll,ll>
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
const ll maxn=5e3+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const ll MOD=(1e9+7);
const ll MOD2=1000002173;
const ld PI=acos(-1);
const ld eps=1e-9;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#define GET_POS(c,x) (lower_bound(c.begin(),c.end(),x)-c.begin())
ll mult(ll a,ll b){
    return ((a%MOD)*(b%MOD))%MOD;
}
ll mypow(ll a,ll b,ll MOD){
    if(b<=0) return 1;
    ll res=1LL;
    while(b){
        if(b&1) res=(res*a)%MOD;
        a=(a*a)%MOD;
        b>>=1;
    }
    return res;
}
vector<int> v[maxn];
int d[maxn];
int main(){
    ios::sync_with_stdio(false),cin.tie(0);
    int n;
    cin>>n;
    REP(i,n){
        int k;
        cin>>k;
        while(k--){
            int x;
            cin>>x;
            --x;
            v[x].pb(i);
        }
    }
    int ans=INF;
    REP(st,n){
        queue<int> q;
        q.push(st);
        REP(i,n) d[i]=-1;
        d[st]=1;
        while(!q.empty()){
            int z=q.front();
            q.pop();
            for(int x:v[z]){
                if(d[x]==-1){
                    d[x]=d[z]+1;
                    q.push(x);
                }
            }
        }
        int tot=0;
        REP(i,n){
            tot+=d[i];
            if(d[i]==-1) tot=INF;
        }
        MNTO(ans,tot);
    }
    cout<<ans;
}

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