I don't know why my solution is giving WA. Though it is not the approach given in the editorials still I can't figure out where my solution is wrong. Question Link : http://codeforces.com/contest/992/problem/B My Solution : http://codeforces.com/contest/992/submission/39371128 asked 19 Jun '18, 22:23

Your assumption that if xy is a perfect square then root of it will be a valid pair seems wrong. In the 15th test case where you are getting wrong answer (r,r) is not a valid pair. So i modified that statement to answered 19 Jun '18, 23:11

__gcd(r,r) will be r which may or may not be equal to x but outside the loop you are checking r*r==xy then subtracting 1 from ans but (r,r) may not have been taken into account. answered 19 Jun '18, 23:15
