Submission #396910

#	Time	Username	Problem	Language	Result	Execution time	Memory
396910		AQT	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	332 KiB

Main

#include <bits/stdc++.h>

using namespace std;

int N;
int arr[200005];
/*
int mnpre[200005];
long long sumpre[200005];
int mnsuf[200005];
long long sumsuf[200005];
*/
int mxpre[200005];
int mxsuf[200005];

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> N;
	for(int i = 1; i <= N; i++){
		cin >> arr[i];
	}
	/*
	for(int i = 1; i <= N; i++){
		mnpre[i] = max(arr[i], mnpre[i-1] + 1);
		sumpre[i] = sumpre[i-1] + mnpre[i] - arr[i];
	}
	for(int i = N; i; i--){
		mnsuf[i] = max(arr[i], mnsuf[i+1] + 1);
		sumsuf[i] = sumsuf[i+1] + mnsuf[i] - arr[i];
	}
	long long ans = LLONG_MAX/2;
	for(int i = 1; i <= N; i++){
		int lft = mnpre[i-1];
		int rht = mnsuf[i+1];
		long long tot = sumpre[i-1] + sumsuf[i+1];
		tot += max({lft, rht, arr[i]}) - arr[i];
		ans = min(ans, tot);
	}
	cout << ans;
	*/
	for(int i = 1; i <= N; i++){
		mxpre[i] = max(0, arr[i-1] + 1 - arr[i]);
		mxpre[i] += mxpre[i-1];
	}
	for(int i = N; i; i--){
		mxsuf[i] = max(0, arr[i+1] + 1 - arr[i]);
		mxsuf[i] += mxsuf[i+1];
	}
	int ans = INT_MAX;
	for(int i = 1; i <= N; i++){
		ans = min(ans, max(mxsuf[i], mxpre[i]));
	}
	cout << ans;
}

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