Submission #1186863

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186863		PieArmy	Bigger segments (IZhO19_segments)	C++20	100 / 100	45 ms	8264 KiB

segments

#include<bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define fr first
#define sc second
#define endl '\n'
using namespace std;

int n;
ll arr[500023];
int dp[500023],las[500023];

int main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>arr[i];
		arr[i]+=arr[i-1];
		dp[i]=1;
	}
	for(int i=1;i<n;i++){
		int l=i+1,r=n+1;
		while(l<r){
			int m=(l+r)/2;
			if(arr[m]+arr[las[i]]>=arr[i]*2)r=m;
			else l=m+1;
		}
		if(l!=n+1){
			las[l]=i;
			dp[l]=dp[i]+1;
		}
		if(las[i+1]<las[i]){
			las[i+1]=las[i];
			dp[i+1]=dp[i];
		}
	}
	cout<<dp[n];
}

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