RoundE

APAC 2016 Round E

https://code.google.com/codejam/contest/8264486/dashboard

Problem A: Lazy Spelling Bee

Simple. For each position, check how many letter can it spell.

Problem B: Robot Rock Band

Simple. For each number a in A and each number b in B, calculate a^b and rememeber into a HashMap.
Then for each number c in C and each number d in D, calculate how many pairs are there in HashMap where a^b=K^c^d.

Problem C: Not So Random

Another HashMap problem.
For each loop, calculate all possible values generated and its possibility.

Problem D: Sums of Sums

Hard, extremely hard problem.
Please read this Quora Explanation if you don't have any idea.
Check D.java for my implementation.