Submission #832842

#	Time	Username	Problem	Language	Result	Execution time	Memory
832842		amunduzbaev	Keys (IOI21_keys)	C++17	0 / 100	0 ms	212 KiB

keys

#include "bits/stdc++.h"
using namespace std;

#define ar array
typedef long long ll;
//~ #define int ll

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c) {
	int n = r.size();
	int m = u.size();
	
	vector<vector<ar<int, 2>>> edges(n);
	for(int i=0;i<m;i++){
		edges[u[i]].push_back({v[i], c[i]});
		edges[v[i]].push_back({u[i], c[i]});
	}
	
	int res = n + 1;
	vector<int> ans;
	vector<int> used(n), cviz(n);
	vector<vector<int>> q;
	int cnt = 0;
	
	for(int i=0;i<n;i++){
		if(r[i] || edges[i].empty()){
			used[i] = 1;
			res = 0;
		}
	}
	
	if(!res) return used;
	
	for(int i=0;i<n;i++){
		fill(used.begin(), used.end(), 0);
		fill(cviz.begin(), cviz.end(), 0);
		q.assign(n, vector<int>());
		cnt = 0;
		
		queue<int> qq;
		qq.push(i);
		
		while(!qq.empty()){
			cnt++;
			int u = qq.front(); qq.pop();
			
			used[u] = 1;
			if(!cviz[r[u]]){
				cviz[r[u]] = 1;
				for(auto x : q[r[u]]){
					if(!used[x]) qq.push(x);
				}
			}
			
			for(auto [x, c] : edges[u]){
				if(used[x]) continue;
				if(cviz[c]){
					qq.push(x);
				} else {
					assert(false);
					q[c].push_back(x);
				}
			}
		}
		
		if(res > cnt) res = cnt, ans.clear();
		if(res == cnt) ans.push_back(i);
	}
	
	fill(used.begin(), used.end(), 0);
	for(auto x : ans) used[x] = 1;
	
	return used;
}

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