class Solution {
public int maxProfit(int[] ar) {
int b=ar[0];
int s=0;
int max=0;
for(int x=1;x<ar.length;x++)
{
if(b>ar[x])
b=ar[x];
}
if(ar[x]-b>max)
max=ar[x]-b;
s=ar[x];
return max;
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