Submission #630351

#	Time	Username	Problem	Language	Result	Execution time	Memory
630351		kakayoshi	Hacker (BOI15_hac)	C++14	0 / 100	1 ms	340 KiB

hac

#include <bits/stdc++.h>
using namespace std;
#define forw(i,a,b) for(int i=a;i<=b;i++)
#define forb(i,a,b) for(int i=a;i>=b;i--)
#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(),a.end()
#define getbit(mask,i) ((mask>>i)&1)
#define getnum(i) (1<<(i))
#define maxi(a,b) (a)=max((a),(b))
typedef long long int ll;
const ll maxN=3e5+5;
const ll mod=1e9+7;
const ll oo=1e18;
ll n,len,sum,a[maxN],pre[maxN],ans[maxN],suf[maxN],out;
void solve()
{
    cin>>n;
    len=n/2;
    forw(i,1,n)
    {
        cin>>a[i];
        a[i+n]=a[i];
        sum+=a[i];
    }
    forw(i,1,2*n)
        pre[i]=pre[i-1]+a[i];
    forb(i,n,1)
    {
        ans[i]=pre[i+len-1]-pre[i-1];
        suf[i]=max(suf[i+1],ans[i]);
    }
    ll tmp=0;
    forw(i,1,n)
    {
        if (i-len>=1) tmp=max(tmp,ans[i-len]);
        out=max(out,sum-max(tmp,suf[i+1]));
    }
    cout<<out;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    //freopen("bruh.inp","r",stdin);
    //freopen("bruh.out","w",stdout);
    solve();
    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 40