Submission #500940

#	Time	Username	Problem	Language	Result	Execution time	Memory
500940		dxz05	Bosses (BOI16_bosses)	C++14	100 / 100	1446 ms	47664 KiB

bosses

#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 998244353;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 222;

vector<int> g[N], g2[N];

int sum = 0;
int dfs(int v){
    int res = 1;
    for (int u : g2[v]){
        res += dfs(u);
    }
    sum += res;
    return res;
}

int n;
int bfs(int root){
    queue<int> q;
    vector<bool> used(n, false);
    q.push(root);
    used[root] = true;

    for (int i = 0; i < n; i++) g2[i].clear();

    while (!q.empty()){
        int v = q.front(); q.pop();
        for (int u : g[v]){
            if (!used[u]){
                g2[v].push_back(u);
                used[u] = true;
                q.push(u);
            }
        }
    }

    if (count(all(used), false)) return INF;

    sum = 0;
    dfs(root);

    return sum;
}

void solve(int TC) {
    cin >> n;

    for (int i = 0; i < n; i++){
        int k;
        cin >> k;
        while (k--){
            int x;
            cin >> x;
            x--;
            g[x].push_back(i);
        }
    }

    int ans = INF;
    for (int i = 0; i < n; i++){
        ans = min(ans, bfs(i));
    }

    cout << ans;

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

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

    int TC = 1;
//    cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

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