Submission #807198

#	Time	Username	Problem	Language	Result	Execution time	Memory
807198		annabeth9680	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	75 ms	6908 KiB

Main

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

int main()
{
    int N; cin >> N;
    vector<ll> arr(N);
    for(int i = 0;i<N;++i) cin >> arr[i];
    vector<ll> f(N,0),g(N,0); //f : for increasing numbers before i; g : for decreasing numbers after i (that are bigger than arr[i])
    for(int i = 1;i<N;++i){
        f[i] = f[i-1]+max(arr[i-1]-arr[i]+1,0ll);
    }
    for(int i = N-2;i>=0;--i){
        g[i] = g[i+1]+max(arr[i+1]-arr[i]+1,0ll);
    }
    ll ans = 1e18;
    for(int i = 0;i<N;++i){
        //cout << f[i] << " " << g[i] << "\n";
        ans = min(ans,max(f[i],g[i]));
    }
    cout << ans << "\n";
    return 0;
}

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