Submission #1293495

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293495		thaibeo123	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	18 ms	4316 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define NAME "A"
#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define MASK(x) (1ll << (x))
#define BIT(x, i) (((x) >> (i)) & 1)

const int N = 2e5 + 5;

int n;
int a[N];
ll pre[N], suf[N];

void input() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
}

void solve() {
    for (int i = 2; i <= n; i++) {
        pre[i] = pre[i - 1] + max(0, a[i - 1] - a[i] + 1);
    }
    for (int i = n - 1; i >= 0; i--) {
        suf[i] = suf[i + 1] + max(0, a[i + 1] - a[i] + 1);
    }
    ll ans = 1e18;
    for (int i = 1; i <= n; i++) {
        ans = min(ans, max(pre[i], suf[i]));
    }
    cout << ans;
}

signed main() {
    if (fopen(NAME".INP", "r")) {
        freopen(NAME".INP", "r", stdin);
        freopen(NAME".OUT", "w", stdout);
    }
    cin.tie(0)->sync_with_stdio(0);

    int t = 1;
    //cin >> t;
    while (t--) {
        input();
        solve();
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen(NAME".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:43:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         freopen(NAME".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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