Submission #723623

#	Time	Username	Problem	Language	Result	Execution time	Memory
723623		kas_s	Hacker (BOI15_hac)	C++17	0 / 100	1 ms	212 KiB

hac

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int N;
    cin >> N;
    vector<int> a(N);
    long long s = 0;
    for (int &v: a) {
        cin >> v;
        s += v;
    }
    for (int i = 0; i < N; i++) a.push_back(a[i]);
    long long res = 0;
    for (int i = 0; i < N; i++) {
        int len = N / 2;
        long long window = 0;
        for (int k = i+1; k < i+len+1; k++) window += a[k];
        long long best = window;
        window = 0;
        for (int j = 0; j < len; j++) window += a[j]; 
        for (int r = len; r < N + N; r++) {
            window += a[r];
            window -= a[r - len];
            if ((r - len + 1) % N <= i && r % N >= i) continue;
            best = max(window, best);
            
        }
        res = max(res, s - best);
    }
    cout << res;
    return 0;
}

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