Sheldon Cooper unique string (C++)

#1

I have used map instead of array for lastindex and visited
3 test cases not passing
please check

#2

Hey Nischay, one of your condition in line 28 is incorrect!
correct one is lastindex[s1.top()]>i
as you just have to see whether current popped element can come later or not.

#3

thanks a lot for the help :slight_smile: