Submission #655932

#	Time	Username	Problem	Language	Result	Execution time	Memory
655932		aebov	Bitaro’s Party (JOI18_bitaro)	C++17	0 / 100	5 ms	7316 KiB

bitaro

#include<iostream>
#include<vector>
#include<algorithm>
#include<queue>
#include<set>
#include<queue>
#define pb push_back
using namespace std;

const int N = (int)1e5 + 5;
int n , m, q, u, v, t, y, x, ret = -1, dis[N], mx = 0, dp[N];
bool bad[N];
vector<int> out[N], in[N], flo[N];
queue<int> qu;

void bfs(){
	qu.push(t); dis[t] = 0; flo[0].pb(t);
	while(!qu.empty()){
		int v = qu.front(); qu.pop();
		for(auto u : in[v]){
			if(dis[v] + 1 < dis[u]){
				dis[u] = dis[v] + 1, qu.push(u);
				flo[dis[u]].pb(u);
				dp[u] = dis[u];
			}
		}
	}
	for(int i = n; i >= 0; i --){
		for(auto x : flo[i]){
			for(auto y : out[x]){
				if(dis[y] != 1000000000) dp[x] = max(dp[x], dp[y]  + 1);
			}
			if(!bad[x])ret= max(ret, dp[x]);
		}
	}
}
int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> m >> q;
	for(int i = 0; i < m; i ++){
		cin >> u >> v;
		out[u].pb(v); in[v].pb(u);
	}fill(dis, dis + n + 2, 1000000000);
	while(q --){
		cin >> t >> y;
		while(y --)cin >> x, bad[x] = 1;
		bfs();
		cout << ret << endl;
	}exit(0);
}

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