Submission #1162209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1162209		LilPluton	Bosses (BOI16_bosses)	C++20	100 / 100	415 ms	31936 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ar array
#define all(x) x.begin(), x.end()
#define sortall(x) sort(all(x)) 
#define rep(i,a,b) for(int i = a; i < b; i++)
#define per(i,a,b) for(int i = a; i >= b; i--)
#define trav(a,x) for(auto& a : x)
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define endl '\n'
#define debug(x) cerr << #x << " = " << x << endl
const int N = 1e6 + 5;

struct BIT{
    int n;
    vector<int>ft;
    void init(int _n){
        n = _n;
        ft.resize(n + 1);
    }
    void update(int x, int val){
        for(; x <= n; x += x & -x){
            ft[x] += val;
        }
    }
    int query(int x){
        int res = 0;
        for(; x > 0; x -= x & -x){
            res += ft[x];
        }
        return res;
    }
    int get(int l,int r){
        return query(r) - query(l - 1);
    }
};
struct DSU{
    int n;
    vector<int> par, siz;
    void init(int _n){
        n = _n + 5;
        par.resize(n);
        siz.resize(n);
        iota(all(par), 0);
        fill(all(siz), 1);
    }
    int find(int x){
        return x == par[x] ? x : par[x] = find(par[x]);
    }
    void unite(int x, int y){
        x = find(x);
        y = find(y);
        if(x != y){
            if(siz[x] < siz[y]) swap(x, y);
            par[y] = x;
            siz[x] += siz[y];
        }
    }
};
vector<int>adj[N];
vector<int>dis(N);
void solve(){
    int ans = INT_MAX;
    int n;
    cin >> n;
    rep(i, 0, n){
        int m;
        cin >> m;
        rep(j, 0, m){
            int x;
            cin >> x;
            adj[--x].push_back(i);
        }
    }
    rep(nt, 0, n){
        rep(j, 0, n){
            dis[j] = INT_MAX;
        }
        queue<int>q;
        q.push(nt);
        dis[nt] = 1;
        while(!q.empty()){
            int u = q.front();
            q.pop();
            for(auto v : adj[u]){
                if(dis[v] == INT_MAX){
                    dis[v] = dis[u] + 1;
                    q.push(v);
                }
            }
        }
        int cn = 0;
        rep(j, 0, n){
            cn += dis[j];
        }
        ans = min(ans, cn);
    }
    cout << ans << endl;
}

signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int T = 1;
    while(T--){
        solve();
    }
}

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