Submission #835445

#	Time	Username	Problem	Language	Result	Execution time	Memory
835445		Baytoro	Keys (IOI21_keys)	C++17	37 / 100	94 ms	25612 KiB

keys

#include "keys.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(), x.end()
vector<pair<int,int>> g[2005];

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c) {
	int n=r.size();
	int res=1e9;
	vector<vector<int>> q(n);
	for(int i=0;i<(int)u.size();i++){
		g[u[i]].pb({v[i],c[i]});
		g[v[i]].pb({u[i],c[i]});
	}
	vector<int> a(n),vec;
	for(int i=0;i<n;i++){
		
		int c=0;
		vector<int> used(n);
		vector<int> vis(n);
		q.assign(n,vector<int>());
		queue<int> dq;
		dq.push(i);
		used[i]=1;
		while(!dq.empty()){
			c++;
			int a=dq.front();dq.pop();
			if(!vis[r[a]]){
				vis[r[a]]=1;
				for(auto it: q[r[a]]){
					if(used[it]) continue;
					used[it]=1;
					dq.push(it);
				}
			}
			for(auto [it,cc]: g[a]){
				if(used[it]) continue;
				if(vis[cc]){
					used[it]=1;
					dq.push(it);
				}
				else{
					q[cc].pb(it);
				}
			}
		}
		if(res>c) res=c,vec.clear();
		if(res==c) vec.pb(i);
	}
	for(auto it: vec) a[it]=1;
	return a;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33