Submission #942165

#	Time	Username	Problem	Language	Result	Execution time	Memory
942165		dsyz	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	20 ms	7004 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define MAXN (1000005)
int main() {
	ios_base::sync_with_stdio(false);cin.tie(0);
	ll N;
	cin>>N;
	ll arr[N];
	for(ll i = 0;i < N;i++){
		cin>>arr[i];
	}
	ll ans = 1e18;
	ll prefix[N];
	ll Ldiff = 0;
	for(ll i = 0;i < N;i++){
		if(i >= 1) Ldiff += max(0ll,(arr[i - 1] + 1) - arr[i]);
		prefix[i] = Ldiff;
	}
	ll suffix[N];
	ll Rdiff = 0;
	for(ll i = N - 1;i >= 0;i--){
		if(i < N - 1) Rdiff += max(0ll,(arr[i + 1] + 1) - arr[i]);
		suffix[i] = Rdiff;
	}
	for(ll split = 0;split < N;split++){
		ll total = max(prefix[split],suffix[split]);
		ans = min(ans,total);
	}
	cout<<ans<<'\n';
}

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