Hi i am stucked in this problem https://www.hackerrank.com/contests/h42-finals/challenges/mathematical-graph. Can anyone suggest an approach… I tried to calculate all the divisors of each no upto 10^6,but that’s a bit slow. What can be a faster approach to solve this ?
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Link not working brother
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All because of that ‘.’ at the end, which many failed to notice!
See My Solution
Here i just used a concept of DP, In which firstly i sort all the array in ascending order. After that i visit all the numbers that can be divisible by that particular number.
But the question is asking about the isolated number so i used a flag variable to check is there number has been visited so far or not. If i don’t found any number that aren’t given in arr[] and aslo not a factor of my first number then it means that there exist no factor of that particular element.
I hope you will get my logic. Otherwise just debug my code to know how it is working.
If you have any doubt then feel free to comment there.
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Thanks Utkarsh & Banshal 
I got it :),This idea didn’t came to my mind as say if all the no’s are same say 2 & N = 10^5,then the algo will time out…But now on reading the problem statment carefully,i am banging my head :(…Thanks a lot again