Submission #898774

#	Time	Username	Problem	Language	Result	Execution time	Memory
898774		Faisal_Saqib	Rice Hub (IOI11_ricehub)	C++17	100 / 100	139 ms	4896 KiB

ricehub

#pragma once
#include <iostream>
#include <set>
#include <vector>
using namespace std;
vector<long long> vp,pre={0};
long long b;
bool check(int r,int i,int mid,int take)
{
	if((r-i)>=(mid-take))
	{
		long long cur=0;
		long long sum_b=pre[i+1]-pre[i-take+1];
		cur+=((take*vp[i])-sum_b);
		long long sum_f=pre[i+mid-take+1]-pre[i+1];
		cur+=(sum_f-((mid-take)*vp[i]));
		if(cur<=b)
		{
			return 1;
		}
	}
	return 0;
}
int besthub(int r, int l, int x[], long long b1)
{
	b=b1;
	int ans=0;
	vp.push_back(-3e15);
	for(int i=0;i<r;i++)
		vp.push_back(x[i]);
	vp.push_back(3e15);
	for(auto i:vp)
		pre.push_back(pre.back()+i);
	for(int i=1;i<=r;i++)
	{
		// binary search on cnt
		int cnt_s=1;
		int cnt_e=r+1;
		// cout<<"index "<<i<<endl;
		while(cnt_s+1<cnt_e)
		{
			int mid=(cnt_s+cnt_e)/2;
			bool pos=0;
			// cout<<"For "<<mid<<' ';
			int take_s=0;
			int take_e=min(mid,i)+1;
			while(take_s+1<take_e)
			{
				int mid1=(take_s+take_e)/2;
				if((r-i)>=(mid-mid1))
				{
					long long sum_b=pre[i+1]-pre[i-mid1+1];
					sum_b=(mid1*vp[i])-sum_b;
					long long sum_f=(pre[i+mid-mid1+1])-(pre[i+1]);
					sum_f-=(mid-mid1)*vp[i];
					if(sum_b<=sum_f)
					{
						take_s=mid1;
					}
					else
					{
						take_e=mid1;
					}
				}
				else
				{
					// We have to take more from the element less than side so increase s to mid
					take_s=mid1;
				}
			}
			for(int error=-1;error<=1;error++)
			{
				if(check(r,i,mid,take_s+error))
				{
					pos=1;
					break;
				}
			}
			if(pos)
			{
				cnt_s=mid;	
			}
			else
			{
				cnt_e=mid;
			}
		}
		// int cnt=1;
		// long long tm=0;
		// int l=i-1;
		// int r=i+1;
		// while(min(vp[i]-vp[l],vp[r]-vp[i])<=(b-tm))
		// {
		// 	tm+=min(vp[i]-vp[l],vp[r]-vp[i]);
		// 	if((vp[i]-vp[l])==min(vp[i]-vp[l],vp[r]-vp[i]))
		// 	{
		// 		cnt++;
		// 		l--;
		// 	}
		// 	else
		// 	{
		// 		cnt++;
		// 		r++;
		// 	}
		// }
		ans=max(ans,cnt_s);
	}
	return ans;
}

Compilation message (stderr)

ricehub.cpp:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32