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 C (judge verdict: Accepted)

#include <stdio.h>

int main(){
    int h,i,j,n,min,max;
    max = -9999999999;
    
    scanf("%d",&n);
    
    scanf("%d",&h);
    min = h;
	
    for(j = 1;j < n;j++){
      scanf("%d",&i);
      
      if(max > i-min)
         max = max;
      else
         max = i-min;

      if(i > min)
         min = min;
      else 
         min = i;
    }

    printf("%d\n",max);

    return 0;
}