Submission #647628

#	Time	Username	Problem	Language	Result	Execution time	Memory
647628		mychecksedad	Friends (BOI17_friends)	C++17	0 / 100	18 ms	23820 KiB

friends

/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define oset tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;



int n, p, q;
bool dp[N];
vector<vector<int>> solution[N];
bitset<20> g[N];
void solve(){
    cin >> n >> p >> q;
    for(int i = 0; i < n; ++i){
        int m; cin >> m;
        for(int j = 0; j < m; ++j){
            int x; cin >> x; g[i][x] = 1;
        }
    }
    bool ok = 1;
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < n; ++j){
            if(g[i][j] && !g[j][i]){
                ok = 0;
            }
        }
    }
    if(!ok){
        cout << "Detention";
        return;
    }
    for(int i = 0; i < (1<<n); ++i) dp[i] = 0;
    for(int mask = 1; mask < (1<<n); ++mask){
        if(__builtin_popcount(mask) > p) continue;
        vector<int> v;
        bitset<20> a(mask);
        int x = 0;
        for(int j = 0; j < n; ++j){
            if(mask&(1<<j)){
                x += ((a&g[j]) ^ g[j]).count();
                v.pb(j);
            }
        }   
        if(x > q){
            continue;
        }
        dp[mask] = 1;
        solution[mask].pb(v);
    }
    for(int mask = 0; mask < (1<<n); ++mask){
        int s = mask;
        for(; s>0; s=((s-1)&mask)){
            if(dp[s] & dp[mask^s]){       
                dp[mask] = 1;
                solution[mask] = solution[s];
                if(!solution[mask^s].empty())
                    for(auto v: solution[mask^s]) solution[mask].pb(v);
                break;  
            }
        }
    }
    if(dp[(1<<n) - 1]){
        cout << "Home\n";
        cout << solution[(1<<n)-1].size() << '\n';
        for(auto v: solution[(1<<n) - 1]){
            cout << v.size() << '\n';
            for(int x: v) cout << x << ' ';
            cout << '\n';
        }
    }else cout << "Detention";
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:91:16: warning: unused variable 'aa' [-Wunused-variable]
   91 |     int T = 1, aa;
      |                ^~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 37
• Subtask 3: 0 / 12
• Subtask 4: 0 / 31