Submission #941135

#	Time	Username	Problem	Language	Result	Execution time	Memory
941135		a_l_i_r_e_z_a	Hacker (BOI15_hac)	C++17	100 / 100	229 ms	18536 KiB

hac

// In the name of God
// Hope is last to die
 
#include <bits/stdc++.h>
using namespace std;
 
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2")
 
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
#define pb push_back
// #define int long long
#define S second
#define F first
#define mp make_pair
#define smax(x, y) (x) = max((x), (y))
#define smin(x, y) (x) = min((x), (y))
#define all(x) (x).begin(), (x).end()
 
const int maxn = 5e5 + 5;
const int inf = 1e9 + 7;
int n, a[maxn], ps[maxn];
multiset<int> st;

int get(int i){
    int res = ps[min(n, i + (n + 1) / 2 - 1)] - ps[i - 1];
    if(i + (n + 1) / 2 - 1 > n){
        res += ps[i + (n + 1) / 2 - 1 - n];
    }
    return res;
}

int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        ps[i] = ps[i - 1] + a[i];
    }
    st.insert(get(1));
    for(int i = n / 2 + 2; i <= n; i++){
        st.insert(get(i));
    }
    int ans = 0;
    for(int i = 1; i <= n; i++){
        smax(ans, (*st.begin()));
        int j = i - (n - 1) / 2;
        if(j <= 0) j += n;
        st.erase(st.find(get(j)));
        if(i < n) st.insert(get(i + 1));
    }
    cout << ans << '\n';

    return 0;
}

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