You can also do O(2^n) brute-force like a dumbass. Not sure if this is what GP meant. Maybe Facebook only accepts wrong case on the first position (simple to i

You can also do O(2^n) brute-force like a dumbass. Not sure if this is what GP meant. Maybe Facebook only accepts wrong case on the first position (simple to implement) or maybe GP just doesn't know what they do.