public void BuySell(int[] arr)
for(int i=0;i<arr.Length;i++)
for(int j=i+1;j<arr.Length;j++)
if(arr[j]>arr[i] && (maxprofit<(arr[j]-arr[i])))
Console.Write(maxprofit);
public static void Main()
int[] arr=new int[]{7,1,5,3,6,4};
Program p =new Program();