Submission #600239

#	Time	Username	Problem	Language	Result	Execution time	Memory
600239		MilosMilutinovic	Hacker (BOI15_hac)	C++14	40 / 100	1086 ms	2784 KiB

hac

/**
 *    author:  wxhtzdy
 *    created: 20.07.2022 16:47:00
**/
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<long long> pref(2 * n + 1);
  for (int i = 0; i < 2 * n; i++) {
    pref[i + 1] = pref[i] + a[i % n];
  }
  int moves = (n + 1) / 2;   
  vector<long long> val(n + 1);
  for (int i = 1; i <= n; i++) {
    val[i] = pref[i + moves - 1] - pref[i - 1];
  }
  long long ans = 0;
  for (int i = 1; i <= n; i++) {
    long long mn = val[i];
    for (int j = 0; j < moves; j++) {
      int idx = i - j;
      if (idx <= 0) {
        idx = idx + n;
      }
      mn = min(mn, val[idx]);
    }
    ans = max(ans, mn);     
  }
  cout << ans << '\n';                                                     
  return 0;
}

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