Submission #79532

#	Time	Username	Problem	Language	Result	Execution time	Memory
79532		DrumpfTheGodEmperor	Bosses (BOI16_bosses)	C++14	67 / 100	1505 ms	1144 KiB

bosses

#include <bits/stdc++.h>
#define MOD 1000000007
#define INF 1061109567
#define INFLL 4557430888798830399
#define bp __builtin_popcountll
#define pb push_back
#define in(s) freopen(s,"r",stdin);
#define out(s) freopen(s,"w",stdout);
#define fi first
#define se second
#define bw(i,r,l) for (int i=r-1;i>=l;i--)
#define fw(i,l,r) for (int i=l;i<r;i++)
#define fa(i,x) for (auto i:x)
using namespace std;
const int N = 5005;
int n, sz[N];
vector<int> g[N], child[N];
bool used[N];
int dfs(int u) {
	sz[u] = 1;
	int ans = 0;
	fa (v, child[u]) {
		ans += dfs(v);
		sz[u] += sz[v];
	}
	ans += sz[u];
	return ans;
}
signed main() {
	#ifdef BLU
	in("blu.inp");
	#endif
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n;
	fw (i, 0, n) {
		int k;
		cin >> k;
		while (k--) {
			int x;
			cin >> x;
			x--;
			g[x].pb(i);
		}
	}
	/*
	Salary of person u is equal to the number of nodes inside the subtree
	Fix root as r. At each step just BFS into all possible choices.
	*/
	int res = INF;
	fw (r, 0, n) {
		queue<int> q;
		fw (i, 0, n) child[i].clear();
		q.push(r);
		int lft = n;
		memset(used, 0, sizeof used);
		used[r] = 1;
		while (!q.empty()) {
			lft--;
			int u = q.front(); q.pop();
			fa (v, g[u]) if (!used[v]) {
				used[v] = 1;
				child[u].pb(v);
				q.push(v);
			}
		}
		int ans = dfs(r);
		if (!lft) res = min(res, ans);
	}
	cout << res;
	return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 0 / 33