Submission #1172346

#	Time	Username	Problem	Language	Result	Execution time	Memory
1172346		DanielPr8	Political Development (BOI17_politicaldevelopment)	C++20	54 / 100	3095 ms	28148 KiB

politicaldevelopment

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvl = vector<vll>;
using pll = pair<ll,ll>;
using vpl = vector<pll>;
using vvp = vector<vpl>;
using vb = vector<bool>;
using vvb = vector<vb>;
#define f first
#define s second
#define pb push_back
#define all(v) v.begin(),v.end()
vll fr;
bool chek(ll wh, vector<set<ll>>& g){
    for(ll i = 0; i < fr.size(); ++i){
        if(!(wh & (1<<i)))continue;
        for(ll j = i+1; j < fr.size(); ++j){
            if(!(wh & (1<<j)))continue;
            if(!g[fr[i]].count(fr[j]))return 0;
        }
    }
    return 1;
}
ll calc(vector<set<ll>>& g){
    int ans = 0;
    for(ll i = 0; i < (1<<fr.size()); ++i){
        if(chek(i,g))ans = max(ans, __builtin_popcount(i));
    }
    return ans;
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(NULL);
    ll n, k, a, b;
    cin >> n >> k;
    vector<set<ll>> g(n);
    for(ll i = 0; i < n; ++i){
        cin >> a;
        while(a--){
            cin >> b;
            g[i].insert(b);
        }
    }
    priority_queue<pll, vpl, greater<pll>> pq;
    vb vs(n);
    ll ans = 0;
    for(ll i = 0; i < n; ++i)pq.push({g[i].size(),i});
    while(!pq.empty()){
        auto [d, cr] = pq.top();pq.pop();
        if(d!=g[cr].size())continue;
        if(vs[cr])continue;
        vs[cr]=1;
        fr.clear();
        for(ll i = 0; i < n; ++i){
            if(g[cr].count(i)){
                fr.pb(i);
                g[i].erase(cr);
                pq.push({g[i].size(), i});
            }
        }
        ans = max(ans, 1+calc(g));
    }
    cout << ans;
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 38 / 38
• Subtask 5: 0 / 23