Submission #371017

#	Time	Username	Problem	Language	Result	Execution time	Memory
371017		valerikk	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	34 ms	6656 KiB

Main

#include <bits/stdc++.h>

typedef long long ll;

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  n += 2;
  vector <ll> a(n);
  a[0] = a[n - 1] = 0;
  for (int i = 1; i < n - 1; i++) cin >> a[i];
  vector <ll> d(n);
  for (int i = 1; i < n; i++) d[i] = a[i] - a[i - 1];
  vector <ll> pref(n - 1);
  for (int i = 0; i < n - 1; i++) {
    pref[i] = max(0ll, -d[i + 1] + 1);
    if (i != 0) pref[i] += pref[i - 1];
  }
  vector <ll> suf(n - 1);
  for (int i = n - 2; i >= 0; i--) {
    suf[i] = max(0ll, d[i + 1] + 1);
    if (i != n - 2) suf[i] += suf[i + 1];
  }
  ll ans = 1e18;
  for (int i = 0; i < n - 2; i++) ans = min(ans, max(pref[i], suf[i + 1]));
  cout << ans << endl;
  return 0;
}

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60