oj.uz

Submission #575886

# Submission time Handle Problem Language Result Execution time Memory
575886 2022-06-11T13:37:57 Z arneves Parachute rings (IOI12_rings) C++17
55 / 100
 4000 ms 94584 KB 
/*
	  ______  _____  _______ _     _ _______ __   _  _____  _  _  _
	 |_____/ |     | |       |____/  |______ | \  | |     | |  |  |
	 |    \_ |_____| |_____  |    \_ ______| |  \_| |_____| |__|__|
	
	
	       .      .           .      .           .      .    	
	       _\/  \/_           _\/  \/_           _\/  \/_    	
	        _\/\/_             _\/\/_             _\/\/_     	
	    _\_\_\/\/_/_/_     _\_\_\/\/_/_/_     _\_\_\/\/_/_/_ 	
	     / /_/\/\_\ \       / /_/\/\_\ \       / /_/\/\_\ \  	
	        _/\/\_             _/\/\_             _/\/\_     	
	        /\  /\             /\  /\             /\  /\     	
	       '      '           '      '           '      '    	
	
*/
 
#pragma GCC optimize ("O3")
#pragma GCC target ("avx2")
 
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <climits>
#include <cstdint>
#include <cmath>
#include <chrono>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_set>
#include <unordered_map>
#include <vector>
 
using namespace std;
typedef long long ll;

class DSU //with range compression and union by subtree size
{
	public:
	ll N;
	vector<ll> p,siz;
	
	DSU(ll n)
	{
		N=n; for(int i=0; i<N; i++){p.push_back(i); siz.push_back(1);}
	}
	
	ll find(ll x)
	{
		if(p[x]==x) {return x;}
		ll ans=find(p[x]);
		p[x]=ans; 
		return ans;
	}
	
	void unionn(ll a, ll b)
	{
		a=find(a); b=find(b);
		if(a==b) {return;}
		if(siz[a]>siz[b]) {swap(a,b);}
		p[a]=b; siz[b]+=siz[a];
	}
};

const int MX=1e6+5;
int n;
vector<int> adj[MX];
int visitados[MX];
int grau[MX];
int ciclos=0;
vector<int> gajos_no_ciclo;
vector<int> cand;
vector<int> grau3;
vector<int> grau4;
DSU dsu(MX);

void Init(int N){
	n=N;
	for(int i=0; i<n; i++) grau[i]=0;
}

int dfs2(int s, int p, int t){
	int ans=0;
	for(auto u: adj[s]){
		if(u!=p){
			if(u==t){
				ans++;
			}else{
				ans+=dfs2(u,s,t);
			}
		}
	}
	if(ans){
		gajos_no_ciclo.push_back(s);
		return 1;
	}else{
		return 0;
	}
}

void Link(int A, int B){
	adj[A].push_back(B);
	adj[B].push_back(A);
	grau[A]++;
	grau[B]++;
	if(dsu.find(A)==dsu.find(B)){
		if(ciclos==0){
			dfs2(A,-1,B);
			gajos_no_ciclo.push_back(B);
		}
		ciclos++;
	}
	
	dsu.unionn(A,B);
	
	if(grau[A]==3){
		grau3.push_back(A);
		for(auto u: adj[A]) cand.push_back(u);
	}
	if(grau[B]==3){
		grau3.push_back(B);
		for(auto u: adj[B]) cand.push_back(u);
	}
	if(grau[A]==4){
		grau4.push_back(A);
	}
	if(grau[B]==4){
		grau4.push_back(B);
	}
}

int dfs(int s, int p, int pro){
	visitados[s]=1;
	int ans=0;
	for(auto u: adj[s]){
		if(u!=p && u!=s && u!=pro){
			if(visitados[u]) return 1;
			else ans+=dfs(u,s,pro);
		}
	}
	return ans>0;
}

int f(int u){
	for(int i=0; i<n; i++) visitados[i]=0;
	for(int i=0; i<n; i++){
		if(i!=u && !visitados[i]){
			if(dfs(i,-1,u)){
				return 0;
			}
		}
	}
	for(int i=0; i<n; i++){
		if(i==u) continue;
		vector<int> v;
		for(auto y: adj[i]) if(y!=u) v.push_back(y);
		if(v.size()>2) return 0;
	}
	return 1;
}

int CountCritical(){
	if(grau4.size()>=2) return 0;
	if(grau4.size()==1) return f(grau4[0]);
	//if(grau3.size()>=5) return 0;
	if(grau3.size()>0){
		int ans=0;
		set<int> s;
		for(auto u: cand) s.insert(u);
		for(auto u: grau3) s.insert(u); 
		for(auto u: s) if(f(u)) ans++;
		return ans;
	}
	if(ciclos>=2){
		return 0;
	}
	if(ciclos==1){
		return gajos_no_ciclo.size();
	}
	
	/*int ans=0;
	for(int i=0; i<n; i++) if(f(i)) ans++;//, cout<<i<<" ";*/
	
	return n;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 39604 KB Output is correct
2 Correct 33 ms 39792 KB Output is correct
3 Correct 30 ms 39976 KB Output is correct
4 Correct 33 ms 39708 KB Output is correct
5 Correct 30 ms 39788 KB Output is correct
6 Correct 37 ms 39936 KB Output is correct
7 Correct 29 ms 39676 KB Output is correct
8 Correct 30 ms 39788 KB Output is correct
9 Correct 33 ms 39840 KB Output is correct
10 Correct 34 ms 39852 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 411 ms 58020 KB Output is correct
2 Correct 1071 ms 71028 KB Output is correct
3 Correct 918 ms 76240 KB Output is correct
4 Correct 995 ms 74800 KB Output is correct
5 Correct 995 ms 75672 KB Output is correct
6 Correct 1066 ms 94584 KB Output is correct
7 Correct 881 ms 75896 KB Output is correct
8 Correct 2506 ms 76380 KB Output is correct
9 Correct 3012 ms 79032 KB Output is correct
10 Correct 676 ms 72932 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 39604 KB Output is correct
2 Correct 33 ms 39792 KB Output is correct
3 Correct 30 ms 39976 KB Output is correct
4 Correct 33 ms 39708 KB Output is correct
5 Correct 30 ms 39788 KB Output is correct
6 Correct 37 ms 39936 KB Output is correct
7 Correct 29 ms 39676 KB Output is correct
8 Correct 30 ms 39788 KB Output is correct
9 Correct 33 ms 39840 KB Output is correct
10 Correct 34 ms 39852 KB Output is correct
11 Correct 58 ms 39800 KB Output is correct
12 Correct 46 ms 40176 KB Output is correct
13 Correct 106 ms 40116 KB Output is correct
14 Correct 52 ms 39948 KB Output is correct
15 Correct 54 ms 40008 KB Output is correct
16 Correct 33 ms 40028 KB Output is correct
17 Correct 328 ms 40172 KB Output is correct
18 Correct 51 ms 40320 KB Output is correct
19 Correct 32 ms 40064 KB Output is correct
20 Correct 151 ms 40100 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 39604 KB Output is correct
2 Correct 33 ms 39792 KB Output is correct
3 Correct 30 ms 39976 KB Output is correct
4 Correct 33 ms 39708 KB Output is correct
5 Correct 30 ms 39788 KB Output is correct
6 Correct 37 ms 39936 KB Output is correct
7 Correct 29 ms 39676 KB Output is correct
8 Correct 30 ms 39788 KB Output is correct
9 Correct 33 ms 39840 KB Output is correct
10 Correct 34 ms 39852 KB Output is correct
11 Correct 58 ms 39800 KB Output is correct
12 Correct 46 ms 40176 KB Output is correct
13 Correct 106 ms 40116 KB Output is correct
14 Correct 52 ms 39948 KB Output is correct
15 Correct 54 ms 40008 KB Output is correct
16 Correct 33 ms 40028 KB Output is correct
17 Correct 328 ms 40172 KB Output is correct
18 Correct 51 ms 40320 KB Output is correct
19 Correct 32 ms 40064 KB Output is correct
20 Correct 151 ms 40100 KB Output is correct
21 Correct 44 ms 41132 KB Output is correct
22 Correct 54 ms 41988 KB Output is correct
23 Correct 64 ms 42656 KB Output is correct
24 Execution timed out 4034 ms 41380 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 39604 KB Output is correct
2 Correct 33 ms 39792 KB Output is correct
3 Correct 30 ms 39976 KB Output is correct
4 Correct 33 ms 39708 KB Output is correct
5 Correct 30 ms 39788 KB Output is correct
6 Correct 37 ms 39936 KB Output is correct
7 Correct 29 ms 39676 KB Output is correct
8 Correct 30 ms 39788 KB Output is correct
9 Correct 33 ms 39840 KB Output is correct
10 Correct 34 ms 39852 KB Output is correct
11 Correct 411 ms 58020 KB Output is correct
12 Correct 1071 ms 71028 KB Output is correct
13 Correct 918 ms 76240 KB Output is correct
14 Correct 995 ms 74800 KB Output is correct
15 Correct 995 ms 75672 KB Output is correct
16 Correct 1066 ms 94584 KB Output is correct
17 Correct 881 ms 75896 KB Output is correct
18 Correct 2506 ms 76380 KB Output is correct
19 Correct 3012 ms 79032 KB Output is correct
20 Correct 676 ms 72932 KB Output is correct
21 Correct 58 ms 39800 KB Output is correct
22 Correct 46 ms 40176 KB Output is correct
23 Correct 106 ms 40116 KB Output is correct
24 Correct 52 ms 39948 KB Output is correct
25 Correct 54 ms 40008 KB Output is correct
26 Correct 33 ms 40028 KB Output is correct
27 Correct 328 ms 40172 KB Output is correct
28 Correct 51 ms 40320 KB Output is correct
29 Correct 32 ms 40064 KB Output is correct
30 Correct 151 ms 40100 KB Output is correct
31 Correct 44 ms 41132 KB Output is correct
32 Correct 54 ms 41988 KB Output is correct
33 Correct 64 ms 42656 KB Output is correct
34 Execution timed out 4034 ms 41380 KB Time limit exceeded
35 Halted 0 ms 0 KB -