Submission #648049

#	Time	Username	Problem	Language	Result	Execution time	Memory
648049		mychecksedad	Bosses (BOI16_bosses)	C++17	100 / 100	1309 ms	47740 KiB

bosses

/* 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, d;
ll S;
vector<bool> vis;
vector<int> g[N], r[N];
ll dfs(int v){
    if(r[v].empty()){
        S++;
        return 1;
    }
    ll s = 1;
    for(int u: r[v]) s += dfs(u);
    S += s;
    return s;
}
void bfs(int s){
    queue<int> q;
    vis[s] = 1;
    q.push(s);
    while(!q.empty()){
        int v = q.front(); q.pop();
        for(int u: g[v]){
            if(!vis[u]){
                vis[u] = 1;
                q.push(u);
                r[v].pb(u);
            }
        }
    }
    dfs(s);
}
void solve(){
    cin >> n;
    for(int i = 1; i <= n; ++i){
        int d; cin >> d;
        for(int j = 0; j < d; ++j){
            int x; cin >> x; g[x].pb(i);
        }
    }
    ll best = 1e18;
    for(int i = 1; i <= n; ++i){
        S = 0;
        vis.clear();
        vis.resize(n+1);
        bfs(i);
        bool ok = 1;
        for(int i = 1; i <= n; ++i) ok &= vis[i], r[i].clear();
        if(ok)
            best = min(best, S);
    }
    cout << best;
}





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)

bosses.cpp: In function 'int main()':
bosses.cpp:77:16: warning: unused variable 'aa' [-Wunused-variable]
   77 |     int T = 1, aa;
      |                ^~

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