제출 #1089550

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1089550		coldbr3w	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2009 ms	112268 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
 
#define ll int
#define pll pair<int, int>
#define pb push_back
#define F first
#define S second  
#define all(x) (x).begin(), (x).end()

const ll N = 1e5 + 100;
const ll inf = 1e9;
const ll mod = 1e9 + 7;
const ll block = 90;
ll n,m,q;
vector<ll>adj[N];
vector<pll>best[N];
ll dp[N];
ll vis[N];
bool good[N];
struct ccjv{ll val, u, idx;};
struct cmp{
	bool operator()(const ccjv &a, const ccjv &b){
		return a.val < b.val;
	}
};
void to_thic_cau(){
	cin >> n >> m >> q;
	for(int i = 1; i <= m;i++){
		ll u,v; cin >> u >> v;
		adj[v].pb(u);
	}
	priority_queue<pll> pq;
	for (int i = 1; i<=n; i++){
		pq.push({0,i});
		for (auto u : adj[i]){
			for (auto x : best[u]){
				ll v = x.F, d = x.S;
				pq.push({d + 1, v});
			}
		}
		for (;best[i].size() < block && pq.size(); pq.pop()){
			ll d = pq.top().F, v = pq.top().S;
			if (vis[v] != i){
				vis[v] = i;
				best[i].pb({v, d});
			}
		}
		for(;pq.size();pq.pop());
	}
	while(q--){
		ll t, sz; cin >> t >> sz;
		vector<ll>vec;
		for(int i = 1; i <= sz;i++){
			ll x; cin >> x;
			vec.pb(x);
			good[x] = 1;
		}
		if(t >= block){
			fill(dp, dp + t + 1,-1);
			dp[t] = 0;
			for(int i = t; i >= 1;i--){
				if(dp[i] == -1) continue;
				for(auto j : adj[i]) dp[j] = max(dp[j], dp[i] + 1);
			}
			ll res = -1;
			for(int i = 1; i <= t;i++) if(!good[i]) res = max(res, dp[i]);
			for(auto x : vec) good[x] = 0;
			cout << res << '\n';
		}
		else{
			ll res = -1;
			for(auto x : best[t]){
				ll v = x.F, d = x.S;
				if(!good[v]) res = max(res, d);
			}
			for(auto x : vec) good[x] = 0;
			cout << res << "\n";
		}
	}
}
 
signed main()   
{ 
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	ll tc = 1;
	//cin >> tc;
	while(tc--) to_thic_cau();
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86