Submission #1023118

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023118		Almonther	Hacker (BOI15_hac)	C++98	0 / 100	1 ms	2396 KiB

hac

#include <bits/stdc++.h>

#define suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define co cout<<
//#pragma GCC optimize("O3,Ofast,unroll-loops")
//#pragma GCC target("avx2,sse3,sse4,avx")
using namespace std;
//stuff
ll n;
ll arr[1000001];
ll precal[1000001];
set<pair<ll,ll>>s;
ll sum=0;
void solve(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>arr[i];
        sum+=arr[i];
    }
    for(int i=1;i<=n/2;i++){
        precal[1]+=arr[i];
    }
    s.insert({precal[1],1});
    for(int i=2,j=n/2+1;max(i,j)<=n;i++,j++){
        precal[i]=precal[i-1]+arr[j]-arr[i-1];
        s.insert({precal[i],i});
    }
    for(int j=1,i=n/2+2;max(i,j)<=n;i++,j++){
        precal[i]=precal[i-1]+arr[j]-arr[i-1];
        s.insert({precal[i],i});
    }
    ll mx=-1;
    for(int i=1;i<=n;i++){
        auto it=s.rbegin();
        if((*it).second==i) it++;
        mx=max(mx,sum-(*it).first);
    }
    co mx;
}
int main()
{
    suiii
    int tt=1;
    // cin>>tt;
    while(tt--){
        solve();
    }
    return 0;
}

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