Submission #743739

#	Time	Username	Problem	Language	Result	Execution time	Memory
743739		MODDI	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	340 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef long long ll;
typedef pair<long long, long long> pll;
typedef pair<int,int> pii;
typedef vector<long long> vl;
typedef vector<int> vi;
int main(){
	int n;
	cin>>n;
	vi arr(n);
	for(int i = 0; i < n; i++)	cin>>arr[i];
	int pref[n], suf[n];
	vi cpy = arr;
	pref[0] = 0;
	for(int i = 1; i < n; i++){
		if(arr[i] > arr[i-1])
			pref[i] = 0;
		else{
			int to = arr[i-1]+1;
			pref[i] = to - arr[i];
			arr[i] = to;
		}
	}
	arr = cpy;
	suf[n-1] = 0;
	for(int i = n - 2; i >= 0; i--){
		if(arr[i] > arr[i+1])
			suf[i] = 0;
		else{
			int to = arr[i+1]+1;
			suf[i] = to - arr[i];
			arr[i] = to;
		}
	}
	int pref_max[n], suf_max[n];
	pref_max[0] = pref[0];
	for(int i = 1; i < n; i++)
		pref_max[i] = max(pref_max[i-1], pref[i]);
	suf_max[n-1] = suf[n-1];
	for(int i = n-2; i >= 0; i--){
		suf_max[i] = max(suf_max[i+1], suf[i]);
	}
	int ans = 1e9;
	for(int i = 0; i < n; i++){
		ans = min(ans, max(suf_max[i], pref_max[i]));
	}
	cout<<ans<<endl;

	return 0;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60