Submission #446138

#	Time	Username	Problem	Language	Result	Execution time	Memory
446138		kym	Bosses (BOI16_bosses)	C++14	100 / 100	1254 ms	1092 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define int ll 
#define FOR(i,s,e) for(ll i = s; i <= (ll)e; ++i)
#define DEC(i,s,e) for(ll i = s; i >= (ll)e; --i)
#define IAMSPEED ios_base::sync_with_stdio(false); cin.tie(0);
#ifdef LOCAL
#define db(x) cerr << #x << "=" << x << "\n"
#define db2(x, y) cerr << #x << "=" << x << " , " << #y << "=" << y << "\n"
#define db3(a,b,c) cerr<<#a<<"="<<a<<","<<#b<<"="<<b<<","<<#c<<"="<<c<<"\n"
#define dbv(v) cerr << #v << ":"; for (auto ite : v) cerr << ite << ' '; cerr <<"\n"
#define dbvp(v) cerr << #v << ":"; for (auto ite : v) cerr << "{"  << ite.f << ',' << ite.s << "} "; cerr << "\n"
#define dba(a,ss,ee) cerr << #a << ":"; FOR(ite,ss,ee) cerr << a[ite] << ' '; cerr << "\n"
#define reach cerr << "LINE: " << __LINE__ << "\n";
#else
#define db(x)
#define db2(x,y)
#define db3(a,b,c)
#define dbv(v)
#define dbvp(v)
#define dba(a,ss,ee)
#define reach 
#endif
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define ll long long 
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define f first
#define s second
#define g0(x) get<0>(x)
#define g1(x) get<1>(x)
#define g2(x) get<2>(x)
#define g3(x) get<3>(x)
typedef pair <ll, ll> pi;
typedef tuple<ll,ll,ll> ti3;
typedef tuple<ll,ll,ll,ll> ti4;
ll rand(ll a, ll b) { return a + rng() % (b-a+1); }
const int MOD = 1e9 + 7;
const int inf = (int)1e9 + 500;
const long long oo = (ll)1e18 + 500;
template <typename T> bool chmax(T& a, const T b) { return a<b ? a = b, 1 : 0; }
template <typename T> bool chmin(T& a, const T b) { return a>b ? a = b, 1 : 0; }
const int MAXN = 5005;
int n;
vector<int> children[MAXN];
int val[MAXN];
bool vis[MAXN];
int par[MAXN];
int ans = oo;
void root(int r) {
	memset(val,0,sizeof val);
	memset(vis,0,sizeof vis);
	memset(par,0,sizeof par);
	queue<int> q;
	vector<int>ord;
	vis[r]=1;
	for(q.push(r);q.size();q.pop()) {
		int x=q.front();
		ord.pb(x);
		for(auto v:children[x]) {
			if(vis[v])continue;
			vis[v] = 1;
			q.push(v);
			par[v] = x;
		}
	}
	while(ord.size()) {
		int x = ord.back(); ord.pop_back();
		val[x]++;
		val[par[x]]+=val[x];
	}
	int s=0;
	FOR(i,1,n){
		s+=val[i];
		if(!vis[i])return;
	}
	chmin(ans,s);
}

int32_t main() 
{
	IAMSPEED
	cin>> n;
	FOR(i,1,n) {
		int k; cin >> k;
		FOR(j,1,k) {
			int x; cin >> x;
			children[x].pb(i);
		}
		
	}
	FOR(i,1,n) root(i);
	cout<<ans;
}

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