Submission #829348

#	Time	Username	Problem	Language	Result	Execution time	Memory
829348		Darren0724	Political Development (BOI17_politicaldevelopment)	C++17	100 / 100	1018 ms	28924 KiB

politicaldevelopment

#include<bits/stdc++.h>
using namespace std;
const int N=50005;
vector<int> adj[N],adj1[N];
vector<int> deg(N);
set<pair<int,int>> s;
vector<int> active(N,1);
int calc(int p){
    int sz=adj[p].size();
    //cout<<sz<<endl;
    int g[sz]{};
    for(int i=0;i<sz;i++){
        for(int j=0;j<sz;j++){
            if(i==j||s.find({adj[p][i],adj[p][j]})!=s.end()){
                g[i]|=1<<j;
            }
        }
    }
    int ans=0;
    for(int i=1;i<1<<sz;i++){
        int p=i;
        int cnt=0;
        for(int j=0;j<sz;j++){
            if(i&(1<<j)){
                p&=g[j];
                cnt++;
            }
        }
        if(p==i){
            ans=max(ans,cnt);
        }
    }
    return ans;
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,k;cin>>n>>k;
    for(int i=0;i<n;i++){
        cin>>deg[i];
        adj1[i].resize(deg[i]+1);
        adj1[i][0]=i;
        for(int j=1;j<=deg[i];j++){
            cin>>adj1[i][j];
            s.insert({i,adj1[i][j]});
            s.insert({adj1[i][j],i});
        }
    }
    queue<int> q;
    for(int i=0;i<n;i++){
        if(deg[i]<=k){
            q.push(i);
        }
    }
    int ans=0;
    while(q.size()){
        int p=q.front();
        q.pop();
        for(int j:adj1[p]){
            if(active[j]){
                adj[p].push_back(j);
            }
            deg[j]--;
            if(deg[j]==k){
                q.push(j);
            }
        }
        ans=max(ans,calc(p));
        active[p]=0;
    }
    cout<<ans<<endl;



    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23