제출 #341466

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
341466		ogibogi2004	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	384 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define ll long long
const ll INF=2e17;
const int MAXN=5e5+6;
ll a[MAXN],n;
ll pref[MAXN];
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)cin>>a[i];
	for(int i=1;i<=n;i++)
	{
		pref[i]=pref[i-1]+a[i];
	}
	ll r=n,last=INF,cnt=0;
	while(r!=0)
	{
		//cout<<r<<endl;
		cnt++;
		int j=1;
		for(int i=r;i>=1;i--)
		{
			if(pref[r]-pref[i-1]>last)break;
			ll low=1,high=i-1,mid,ans=-1;
			while(low<=high)
			{
				mid=(low+high)/2;
				if(pref[i-1]-pref[mid-1]>pref[r]-pref[i-1])
				{
					low=mid+1;
					continue;
				}
				if(pref[i-1]-pref[mid-1]>=pref[mid-1])
				{
					ans=mid;
					low=mid+1;
				}
				else high=mid-1;
			}
			//cout<<i<<" "<<ans<<endl;
			if(ans==-1)continue;
			j=i;
			break;
		}
		last=pref[r]-pref[j-1];
		r=j-1;
	}
	cout<<max(1ll,cnt)<<endl;
return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27