제출 #723648

#제출 시각아이디문제언어결과실행 시간메모리
723648kas_sHacker (BOI15_hac)C++17
0 / 100
1 ms212 KiB
#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 + 1) / 2; long long window = 0; for (int j = 0; j < len; j++) window += a[j]; long long best = 0, sec = 0; for (int r = len; r < N + N; r++) { window += a[r]; window -= a[r - len]; if ((r >= i + N && r - len + 1 <= i + N)) { if (best < window) { sec = best; best = window; } else if (sec < window) { sec = window; } } } res = max(res, sec); } cout << res; return 0; }
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