Buy Low, Sell High

import java.util.Scanner;

public class A {
	
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		s.nextLine();
		int[] p = new int[n];
		for (int i=0; i<n; i++) {
			p[i] = s.nextInt();
		}
		
		int minStart = p[0];
		int maxProfitAnywhereBetween = 0;
		int[] l = new int[n];
		for (int i=0; i<n; i++) {
			minStart = Math.min(minStart, p[i]);
			int profitIfSellHere = p[i] - minStart;
			maxProfitAnywhereBetween = Math.max(maxProfitAnywhereBetween, profitIfSellHere);
			l[i] = maxProfitAnywhereBetween;
		}
		
		int maxEnd = p[n-1];
		maxProfitAnywhereBetween = 0; 
		int[] r = new int[n];
		for (int i=n-1; i>=0; i--) {
			maxEnd = Math.max(maxEnd, p[i]);
			int profitIfBuyHere = maxEnd - p[i];
			maxProfitAnywhereBetween = Math.max(maxProfitAnywhereBetween, profitIfBuyHere);
			r[i] = maxProfitAnywhereBetween;
		}
		
		long ans = 0;
		for (int i=0; i<n; i++) {
			ans = Math.max(ans, (long)l[i] + (long)r[i]);
		}
		
		System.out.println(ans);
		s.close();
	}
}

Test 1

Verdict: TIME LIMIT EXCEEDED

Test 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Verdict: TIME LIMIT EXCEEDED

Test 5

Verdict: TIME LIMIT EXCEEDED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: TIME LIMIT EXCEEDED