Problem:
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Maximum Profit

You can obtain profits from foreign exchange margin transactions. For example, if you buy 1000 dollar at a rate of 100 yen per dollar, and sell them at a rate of 108 yen per dollar, you can obtain (108 - 100) × 1000 = 8000 yen.

Write a program which reads values of a currency $R_t$ at a certain time $t$ ($t = 0, 1, 2, ... n-1$), and reports the maximum value of $R_j - R_i$ where $j > i$ .

Input

The first line contains an integer $n$. In the following $n$ lines, $R_t$ ($t = 0, 1, 2, ... n-1$) are given in order.

Output

Print the maximum value in a line.

Constraints

$2 \leq n \leq 200,000$

$1 \leq R_t \leq 10^9$

Sample Input 1

6
5
3
1
3
4
3

Sample Output 1

3

Sample Input 2

3
4
3
2

Sample Output 2

-1

Solution in JAVA (judge verdict: Runtime Error)

import java.util.Scanner;

class Main{
  public static void main(String args[]){

	int n;
	int m[] = new int[100];
	int temp;
	int max = Integer.MIN_VALUE;
	int i;

	Scanner scan = new Scanner(System.in);

	n =  scan.nextInt();
	for(i=0; i<n ; i++)
		m[i] = scan.nextInt();

	temp = m[0];
	for(i=1 ; i<n ; i++){
		if(m[i]-temp > max)
			max = m[i]-temp;
		if(temp > m[i])
			temp = m[i];
	}

	System.out.println(max);

	return;

  }

}