Submission #62455

#	Time	Username	Problem	Language	Result	Execution time	Memory
62455		zetapi	Parachute rings (IOI12_rings)	C++14	20 / 100	4026 ms	42316 KiB

rings

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

#define pb  push_back
#define mp  make_pair
#define ll long long
#define itr ::iterator 

typedef pair<int,int>  pii;

const int MAX=1e6;

vector<int> cur,vec[MAX];

int N,edge,mark[MAX];

void Init(int N_) 
{
  	N=N_;
	for(int A=0;A<N;A++)
	{
		mark[A]=0;
		vec[A].clear();
	}
	return ;
}

void Link(int A,int B) 
{
	//A++;
	//B++;
	vec[A].pb(B);
	vec[B].pb(A);
	return ;
}

void dfs(int node,int br)
{
	cur.pb(node);
	mark[node]=1;
	for(auto A:vec[node])
	{
		if(A==br)
			continue;
		//cout<<"edge between "<<node<<" "<<A<<"\n";
		edge++;
		if(mark[A])
			continue;
		dfs(A,br);
	}
	return ;
}

int ok(int X)
{
	for(auto A:cur)
	{
		if(vec[A].size()==3)
		{
			if(vec[A][0]!=X and vec[A][1]!=X and vec[A][2]!=X)
				return 0;
		}
		else if(vec[A].size()>3)
			return 0;
	}
	return 1;
}

int CountCritical() 
{
	int res=0,l;
	for(int A=0;A<N;A++)
	{
		l=1;
		for(int B=0;B<N;B++)
			mark[B]=0;
		for(int B=0;B<N and l==1;B++)
		{
			if(!mark[B] and (A!=B))
			{
				cur.clear();
				edge=0;
				dfs(B,A);
				if(edge/2>=cur.size())
					l=0;
				else if(!ok(A))
					l=0;
			}
		}
		res+=l;
	}
  	return res;
}

/*signed main()
{
	ios_base::sync_with_stdio(false);

	Init(7);
	cout<<CountCritical()<<"\n";
	Link(1,2);
	cout<<CountCritical()<<"\n";
	Link(0,5);
	cout<<CountCritical()<<"\n";
	Link(2,0);
	cout<<CountCritical()<<"\n";
	Link(3,2);
	cout<<CountCritical()<<"\n";
	Link(3,5);
	cout<<CountCritical()<<"\n";
	Link(4,3);
	cout<<CountCritical()<<"\n";
	return 0;
}*/

Compilation message (stderr)

rings.cpp: In function 'int CountCritical()':
rings.cpp:84:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(edge/2>=cur.size())
        ~~~~~~^~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 17
• Subtask 3: 0 / 18
• Subtask 4: 0 / 14
• Subtask 5: 0 / 31