Submission #868509

#	Time	Username	Problem	Language	Result	Execution time	Memory
868509		mgl_diamond	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	22 ms	6304 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
 
#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define file "input"

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (fopen(file".inp", "r")) {
    freopen(file".inp", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const int N = 2e5+5;
int n, a[N];
ll l[N], r[N];

int main() {
  setIO();

  cin >> n;
  foru(i, 1, n) cin >> a[i];

  foru(i, 1, n-1) {
    l[i] = l[i-1];
    int diff = a[i+1] - a[i];
    if (diff <= 0) l[i] += 1-diff;
  }

  ford(i, n-1, 1) {
    r[i] = r[i+1];
    int diff = a[i+1] - a[i];
    if (diff >= 0) r[i] += diff+1;
  }

  ll ans = 1e18;
  foru(i, 0, n-1) {
    // cout << l[i] << " " << r[i+1] << "\n";
    ans = min(ans, max(l[i], r[i+1]));
  }
  cout << ans;
}

Compilation message (stderr)

Main.cpp: In function 'void setIO()':
Main.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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