Submission #855789

#	Time	Username	Problem	Language	Result	Execution time	Memory
855789		annabeth9680	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	24 ms	7004 KiB

Main

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

int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N; cin >> N;
    vector<int> arr(N);
    for(int i = 0;i<N;++i) cin >> arr[i];
    vector<int> pref(N),suf(N); pref[0] = 0;
    for(int i = 1;i<N;++i){
        pref[i] = pref[i-1]+max(arr[i-1]-arr[i]+1,(int)0);
    }
    suf[N-1] = 0;
    for(int i = N-2;i>=0;--i){
        suf[i] = suf[i+1]+max(arr[i+1]-arr[i]+1,(int)0);
    }
    int ans = (int)(1e18);
    for(int i = 0;i<N;++i){
        //cout << suf[i] << " " << pref[i] << "\n";
        ans = min(ans,max(suf[i],pref[i]));
    }
    cout << ans << "\n";
    return 0;
}

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