Submission #1301697

#	Time	Username	Problem	Language	Result	Execution time	Memory
1301697		fairkrash	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	28 ms	5080 KiB

Main

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
ll INF = 1e18;
ll MOD = 1e9 + 7;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll n;
    cin >> n;
    vector<ll> s(n);
    for (ll i = 0; i < n; i++) {
        cin >> s[i];
    }
    vector<ll> pref(n);
    vector<ll> suf(n);
    ll x = 0;
    ll last = s[0];
    for (ll i = 1; i < n; i++) {
        if (s[i] + x <= last) {
            x = last - s[i] + 1;
            last++;
        } else {
            last = max(last, s[i] + x);
        }
        pref[i] = x;
    }
    x = 0;
    last = s[n - 1];
    for (ll i = n - 2; i >= 0; i--) {
        if (s[i] + x <= last) {
            x = last - s[i] + 1;
            last++;
        } else {
            last = max(last, s[i] + x);
        }
        suf[i] = x;
    }
    ll mx = INF;
    for (ll i = 0; i < n; i++) {
        mx = min(mx, max(pref[i], suf[i]));
    }
    cout << mx << endl;
}

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