Submission #658856

#	Time	Username	Problem	Language	Result	Execution time	Memory
658856		GrandTiger1729	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	32 ms	10104 KiB

Main

#include <iostream>
#include <vector>
using namespace std;

const long long INF = 1e18;
int main(){
    cin.tie(0)->sync_with_stdio(0);
    int n; cin >> n;
    vector<long long> a(n + 2);
    for (int i = 1; i <= n; i++){
        cin >> a[i];
    }
    auto b = a;
    long long pref[n + 2]{};
    for (int i = 1; i <= n; i++){
        pref[i] = pref[i - 1] + max(a[i], a[i - 1] + 1) - a[i];
        b[i] = max(b[i], b[i - 1] + 1);
    }
    auto c = a;
    long long suff[n + 2]{};
    for (int i = n; i >= 1; i--){
        suff[i] = suff[i + 1] + max(a[i], a[i + 1] + 1) - a[i];
        c[i] = max(c[i], c[i + 1] + 1);
    }
    long long ans = INF;
    for (int i = 0; i <= n; i++){
        long long res = max(pref[i], suff[i + 1]) + (pref[i] == suff[i + 1] && b[i] == c[i + 1]);
        ans = min(ans, res);
    }
    cout << ans;
    return 0;
}

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