let's say I have 2 numbers x and y. How do I check if x*y results in an overflow in C++?. Both x and y are long long int.

Hello,

I was solving CSES problemset and am stuck in this question — Question My code — Code

I am getting TLE on 4 test cases. I'm not able to figure out why as I have used standard BFS and therefore the time complexity should be O(m*n). Can someone help me in this?

You have 2 arrays A and B each of size n, that contains integers from 1 to n inclusive. In one move, you can swap corresponding elements of two arrays. Determine if it is possible to have such series of operations (possibly zero) that both arrays contain integers from 1 to n exactly once, if possible print the series of operations (ie indices on which you apply the operations) and -1 if not possible.

eg

A = 3 1 2 1 2

B = 5 4 4 5 3

ans = 3 4

explanation :

after operations

A = 3 1 4 5 2

B = 5 4 2 1 3

Can someone tell me the approach/pseudocode for this?