Submission #884183

#	Time	Username	Problem	Language	Result	Execution time	Memory
884183		OAleksa	Bitaro’s Party (JOI18_bitaro)	C++14	7 / 100	2037 ms	381444 KiB

bitaro

#include<bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int N = 1e5 + 69;
const int B = 320;
int n, m, q, cnt[N], d[N];
vector<int> g[N], in[N];
vector<pair<int, int>> dis[N];
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
  int tt = 1;
	//cin >> tt;
  while (tt--) {
   	cin >> n >> m >> q;
   	for (int i = 1;i <= m;i++) {
   		int a, b;
   		cin >> a >> b;
   		if (a > b)
   			swap(a, b);
   		g[a].push_back(b);
   		in[b].push_back(a);
   	}
   	for (int i = 1;i <= n;i++) {
   		set<pair<int, int>> st;
   		st.insert({0, i});
   		for (auto u : in[i]) {
   			for (auto x : dis[u]) {
   				if (st.size() < B)
   					st.insert({x.f + 1, x.s});
   				else {
   					auto t = *st.begin();
   					if (x.f + 1 > t.f) {
   						st.erase(st.begin());
   						st.insert({x.f + 1, x.s});
   					}
   				}
   			}
   		}
   		assert(st.size() <= B);
   		for (auto u : st)
   			dis[i].push_back(u);
   	}
   	while (q--) {
   		int s, c;
   		cin >> s >> c;
   		int a[c];
   		for (int i = 0;i < c;i++) {
   			cin >> a[i];
   			cnt[a[i]] = 1;
   		}
   		int ans = -cnt[s];
   		if (c < B) {
   			for (auto u : dis[s]) {
   				if (!cnt[u.s])		
   					ans = max(ans, u.f);
   			}
   		}
   		else {
   			for (int i = 1;i <= n;i++) 
   				d[i] = -1;
   			d[s] = 0;
   			for (int i = s;i >= 1;i--) {
   				if (d[i] >= 0) {
	   				if (!cnt[i])
	   					ans = max(ans, d[i]);
	   				for (auto u : in[i]) {
	   					d[u] = max(d[u], d[i] + 1);
	   				}
   				}
   			}
   		}
   		cout << ans << '\n';
   		for (int i = 0;i < c;i++)
   			cnt[a[i]] = 0;
   	}
	}
	return 0;
}

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