Submission #1034639

#	Time	Username	Problem	Language	Result	Execution time	Memory
1034639		vjudge1	Hacker (BOI15_hac)	C++17	100 / 100	223 ms	18300 KiB

hac

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pld pair<ld, ld>
#define pb push_back
#define fi first
#define se second
#define debug(x) cout << #x << " => " << x << endl
#define all(x) x.begin(),x.end()

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int n;cin>>n;
	int m=(n+1)/2;
	int a[n],cnt[n],sum=0;
	for(int i=0;i<n;i++) cin>>a[i];
	for(int i=0;i<m;i++) sum+=a[i];
	for(int i=0;i<n;i++)
	{
		cnt[i]=sum;
		sum-=a[i];
		sum+=(a[(i+m)%n]);
	}
	multiset<int> s;
	for(int i=0;i<m;i++) s.insert(cnt[i]);
	int ans=0;
	for(int i=0;i<n;i++)
	{
		ans=max(ans,*s.begin());
		s.erase(s.find(cnt[i]));
		s.insert(cnt[(i+m)%n]);
	}
	cout<<ans;
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 40 / 40