Submission #477948

#	Time	Username	Problem	Language	Result	Execution time	Memory
477948		LouayFarah	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	35 ms	8536 KiB

Main

#include "bits/stdc++.h"

using namespace std;

#define endl "\n"
#define ll long long
#define pb push_back
#define mp make_pair

const long long MOD = 1e9+7;
const long long INF = 1e18;


void solve(vector<ll> arr, int n, vector<ll> &pre)
{
    for(int i = 1; i<n; i++)
    {
        pre[i] = max(0LL, arr[i-1]-arr[i]+1) + pre[i-1];
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;

    vector<ll> arr(n);
    for(int i = 0; i<n; i++)
        cin >> arr[i];

    vector<ll> pre1(n, 0), pre2(n, 0);
    solve(arr, n, pre1);
    reverse(arr.begin(), arr.end());
    solve(arr, n, pre2);

    ll res = 1e18;
    for(int i = 0; i<n; i++)
    {
        res = min(res, max(pre1[i], pre2[n-i-1]));
    }

    cout << res << endl;

    return 0;
}

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