Submission #1089540

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089540		coldbr3w	Bitaro’s Party (JOI18_bitaro)	C++17	7 / 100	2043 ms	7916 KiB

bitaro

#pragma GCC optimize("Ofast,unroll-loops")
#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 = 222;
ll n,m,q;
vector<ll>adj[N];
vector<pll>best[N];
ll f[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());
	}
	good[0] = 1;
	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; f[x] = -inf;
		}
		if(t >= block){
			for(int i = 1; i <= t;i++) for(auto j : adj[i]) f[i] = max(f[i], f[j] + 1);
			cout << (f[t] < 0 ? -1 : f[t]) << '\n';
			for(auto x : vec) good[x] = 0, f[x] = 0;
		}
		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: 0 / 7
• Subtask 3: 0 / 86