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Given a string of 1’s and 2’s, standing at index ‘i’, you can move exactly two steps forward or backward if s[i]==2 , else you can move one step forward or backward if s[i] ==1. A string is called a good string if you can reach the end of the string by moving every index exactly once.

Now, you have been given two Strings A and B (not necessarily good), you have to return the number of possible sub-sequences of swaps available, such that both the strings become good.

Swap means you can swap A[i] with B[i].

Example:

A = 2211 B = 1111 ans = 8

 N<=10^3

by Expert (110,460 points)