Submission #39093

#	Time	Username	Problem	Language	Result	Execution time	Memory
39093		faustaadp	Dreaming (IOI13_dreaming)	C++14	100 / 100	169 ms	36732 KiB

dreaming

#include "dreaming.h"
#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
ll i,b[1010101],ma1,ma2,i1,hz,a[1010101],ma;
vector<pair<ll,ll> > v[1010101];
vector<ll> v1;
ll rmt(ll aa,ll bb)
{
	if(bb>ma1)
	{
		ma1=bb;
		i1=aa;
	}
	b[aa]=1;
	ll ii;
	for(ii=0;ii<v[aa].size();ii++)
	{
		if(b[v[aa][ii].fi]==0)
		{
			rmt(v[aa][ii].fi,bb+v[aa][ii].se);
		}
	}
}
ll rct(ll aa,ll bb)
{
	ma2=max(ma2,bb);
	b[aa]=2;
	ll ii;
	for(ii=0;ii<v[aa].size();ii++)
	{
		if(b[v[aa][ii].fi]==1)
		{
			rct(v[aa][ii].fi,bb+v[aa][ii].se);
		}
	}
}
ll rrt(ll aa,ll bb,ll cc)
{
	a[cc]=bb;
	if(bb==ma2)
	{
		ll ii;
		for(ii=1;ii<=cc;ii++)
		{
			hz=min(hz,max(ma2-a[ii],a[ii]));
		}
	}
	b[aa]=3;
	ll ii;
	for(ii=0;ii<v[aa].size();ii++)
	{
		if(b[v[aa][ii].fi]==2)
		{
			rrt(v[aa][ii].fi,bb+v[aa][ii].se,cc+1);
		}
	}
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
	for(i=0;i<M;i++)
	{
		v[A[i]].pb(mp(B[i],T[i]));
		v[B[i]].pb(mp(A[i],T[i]));
	}
	for(i=0;i<N;i++)
	{
		if(b[i]==0)
		{
			ma1=0;
			ma2=0;
			hz=10e17;
			rmt(i,0);
			rct(i1,0);
			rrt(i1,0,1);
			v1.pb(hz);
			ma=max(ma,ma2);
		//	cout<<hz<<"\n";
		}
	}
	sort(v1.begin(),v1.end());
	reverse(v1.begin(),v1.end());
	if(v1.size()==1)
		return ma;
	else
	if(v1.size()==2)
		return max(ma,v1[0]+v1[1]+L);
	else
		return max(ma,max(v1[0]+v1[1]+L,v1[1]+v1[2]+L+L));
    return 42;
}

Compilation message (stderr)

dreaming.cpp: In function 'long long int rmt(long long int, long long int)':
dreaming.cpp:21:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(ii=0;ii<v[aa].size();ii++)
           ~~^~~~~~~~~~~~~
dreaming.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
dreaming.cpp: In function 'long long int rct(long long int, long long int)':
dreaming.cpp:34:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(ii=0;ii<v[aa].size();ii++)
           ~~^~~~~~~~~~~~~
dreaming.cpp:41:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
dreaming.cpp: In function 'long long int rrt(long long int, long long int, long long int)':
dreaming.cpp:55:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(ii=0;ii<v[aa].size();ii++)
           ~~^~~~~~~~~~~~~
dreaming.cpp:62:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 14 / 14
• Subtask 2: 10 / 10
• Subtask 3: 23 / 23
• Subtask 4: 18 / 18
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23