Submission #920151

#	Time	Username	Problem	Language	Result	Execution time	Memory
920151		Faisal_Saqib	Global Warming (CEOI18_glo)	C++17	100 / 100	57 ms	10188 KiB

glo

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
using namespace std;
const int N=2e5+100;
int n,x;
long long dp[N],val[N],cpy[N];
pair<int,long long> revert[N];
void GTA6()
{
	for(int i=0;i<=n;i++)
	{
		val[i]=-3e9;
		dp[i]=3e9;
	}
	val[0]=3e9;
	dp[0]=-3e9;
	for(int i=n-1;i>=0;i--)
	{
		cpy[i]=-cpy[i];
		int xc=lower_bound(dp,dp+n+1,cpy[i])-dp;
		revert[i]={xc,val[xc]};
		val[xc]=max(-cpy[i],val[xc]);
		dp[xc]=cpy[i];
		cpy[i]=-cpy[i];
	}
}
int main()
{
	cin.tie(NULL);
	cout.tie(NULL);
	ios::sync_with_stdio(false);
	cin>>n>>x;
	for(int i=0;i<n;i++)
		cin>>cpy[i];
	int ans=0;
	int final=0;
	GTA6();
	for(int i=0;i<=n;i++)
		dp[i]=3e9;
	dp[0]=-3e9;
	int _1_=0;
	for(int i=0;i<n;i++)
	{
		cpy[i]-=x;
		int xc=lower_bound(dp,dp+n+1,cpy[i])-dp;
		dp[xc]=cpy[i];
		val[revert[i].first]=revert[i].second;
		int s=0;
		int e=n+1;
		while(s+1<e)
		{
			int mid=(s+e)/2;
			if(val[mid]>(cpy[i]))
				s=mid;
			else
				e=mid;
		}
		final=max(final,xc+s);
	}
	cout<<final<<'\n';
	return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:37:6: warning: unused variable 'ans' [-Wunused-variable]
   37 |  int ans=0;
      |      ^~~
glo.cpp:43:6: warning: unused variable '_1_' [-Wunused-variable]
   43 |  int _1_=0;
      |      ^~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25