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: Time Limit Exceeded)

#include<stdio.h>

#define TMIN 2
#define TMAX 200000
#define nMIN 1
#define nMAX 1000000

int main(){
  int n[nMAX],Time,i,min,max,j,sub;

  scanf("%d",&Time);
  if(TMIN<=Time&&Time<=TMAX){
    for(i=0;i<Time;i++){
      scanf("%d",&n[i]);
    }
    for(i=0;i<Time-1;i++){
      min=n[i];
      for(j=i+1;j<Time;j++){
	max=n[j];
	if(i==0&&j==1){
	  sub=n[j]-n[i];
	}
	if(sub<max-min)
	sub=max-min;
      }
    }
  }
    else return 0;

    printf("%d\n",sub);
    return 0;
  }