Submission #939329

#	Time	Username	Problem	Language	Result	Execution time	Memory
939329		Amirreza_Fakhri	Hacker (BOI15_hac)	C++17	20 / 100	299 ms	15968 KiB

hac

// In the name of the God
#include <bits/stdc++.h>
#define ll long long
#define int long long
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define pii pair <int, int>
#define smin(x, y) (x) = min((x), (y))
#define smax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(), (x).end()
using namespace std;

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2")

const int inf = 1e9+7;
const int mod = 998244353;
const int maxn = 5e5+5;

int n, v[maxn];
multiset <int> st;

int g(int i, int x = (n+1)/2) {
    if (i+x-1 < n) {
        // if (i == 1) cout << "HI\n" << ' ' << v[i+x-1] << ' ' << (i-1 >= 0 ? v[i-1] : 0) << '\n';
        return v[i+x-1]-(i-1 >= 0 ? v[i-1] : 0);
    }
    int j = (i+x-1)%n;
    return v[j]+v[n-1]-(i-1 >= 0 ? v[i-1] : 0);
}
 
int p(int i, int x = (n+1)/2) {
    i = (i-x+1+3*n)%n;
    return g(i);
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> v[i];
        if (i) v[i] += v[i-1];
    }
    for (int i = 0; i < (n+1)/2; i++) st.insert(g(i));
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int j = ((n+1)/2-1+i)%n;
        smax(ans, *st.begin());
        st.erase(p(j));
        st.insert(g((j+1)%n));
    }
    cout << ans << '\n';
    return 0;
}

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