Submission #458008

#	Time	Username	Problem	Language	Result	Execution time	Memory
458008		julian33	Political Development (BOI17_politicaldevelopment)	C++14	100 / 100	1149 ms	26324 KiB

politicaldevelopment

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {
    cerr<<vars<<" = ";
    string delim="";
    (...,(cerr<<delim<<values,delim=", "));
    cerr<<"\n";
}
#else
#define deb(...) logger(#__VA_ARGS__, __VA_ARGS__)
template<typename ...Args>
void logger(string vars, Args&&... values) {}
#endif

#define pb push_back
#define sz(x) (int)(x.size())
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T> inline void maxa(T& a,T b){a=max(a,b);}
template<typename T> inline void mina(T& a,T b){a=min(a,b);} 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int mxN=5e4+5; //make sure this is right
const int mod=1e9+7;

int n,k,deg[mxN],seen[mxN];
set<int> graph[mxN];

int main(){
    cin.sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #ifdef LOCAL
        freopen("input.txt","r",stdin);
        freopen("output.txt","w",stdout);
    #endif

    cin>>n>>k;
    priority_queue<pii,vector<pii>,greater<pii>> q;
    for(int i=0;i<n;i++){
        cin>>deg[i];
        for(int j=0;j<deg[i];j++){
            int x; cin>>x;
            graph[i].insert(x);
        }
        q.push({deg[i],i});
    }
    int ans=1;
    while(sz(q)){
        pii cur=q.top(); q.pop();
        if(cur.first!=deg[cur.second])
            continue;
        int at=cur.second;
        seen[at]=1;
        vector<int> nd={at};
        for(int i:graph[at]){
            if(!seen[i]){
                deg[i]--;
                q.push({deg[i],i});
                nd.pb(i);
            }
        }
        int adj[15][15]{};
        for(int i=0;i<sz(nd);i++){
            adj[i][i]=1;
            for(int j=0;j<sz(nd);j++){
                if(graph[nd[i]].count(nd[j]))
                    adj[i][j]=1;
            }
        }
        for(int mask=0;mask<(1<<sz(nd));mask++){
            int yes=1;
            for(int i=0;i<sz(nd);i++){
                if(!(mask&(1<<i)))
                    continue;
                for(int j=0;j<sz(nd);j++){
                    if(!(mask&(1<<j)))
                        continue;
                    yes&=adj[i][j];
                    yes&=adj[j][i];
                }
            }
            if(yes)
                maxa(ans,__builtin_popcount(mask));
        }
    }
    cout<<ans<<"\n";
}

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