Submission #342636

#	Time	Username	Problem	Language	Result	Execution time	Memory
342636		ogibogi2004	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	371 ms	34016 KiB

tabletennis

#include<bits/stdc++.h>
using namespace std;
const int MAXN=200002;
int n,k;
int a[MAXN];
bool found=0;
map<int,int> mp;
void check(int s)
{
	vector<int>v1,v2;
	int l=1,r=n+k;
	while(l<r)
	{
		if(v1.size()+v2.size()==n)break;
		if(a[l]+a[r]==s)
		{
			v1.push_back(a[l]);
			v2.push_back(a[r]);
			++l;--r;
		}
		else
		{
			if(a[l]+a[r]>s)
			{
				--r;
			}
			else ++l;
		}
	}
	if(v1.size()+v2.size()<n)return;
	reverse(v2.begin(),v2.end());
	found=1;
	for(auto xd:v1)cout<<xd<<" ";
	for(auto xd:v2)cout<<xd<<" ";
	cout<<"\n";
}
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n>>k;
	for(int i=1;i<=n+k;++i)
	{
		cin>>a[i];
	}
	for(int i=1;i<=2*k;++i)
	{
		for(int j=n-k;j<=n+k;++j)
		{
			++mp[a[i]+a[j]];
		}
	}
	for(auto xd:mp)
	{
		if(xd.second<k)continue;
		check(xd.first);
		if(found)return 0;
	}
	if(n>MAXN/2)assert(false);
	for(auto xd:mp)
	{
		check(xd.first);
		if(found)return 0;
	}
return 0;
}

Compilation message (stderr)

tabletennis.cpp: In function 'void check(int)':
tabletennis.cpp:14:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   14 |   if(v1.size()+v2.size()==n)break;
      |      ~~~~~~~~~~~~~~~~~~~^~~
tabletennis.cpp:30:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |  if(v1.size()+v2.size()<n)return;
      |     ~~~~~~~~~~~~~~~~~~~^~

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 15 / 15
• Subtask 8: 13 / 13