CareerCup

Find the indices of all anagrams of a given word in a another word.
For example: Find the indices of all the anagrams of AB in ABCDBACDAB (Answer: 0, 4, 8)

What is the best way to Contact Bitstamp Customer Support?

I am given an array of Transactions in a ledger. A Transaction object has three things.
1. Sender (which means who started this transaction)
2. Receiver (means who is the destination of transaction)
3. Timestamp (at what time this transaction was executed)

Now I need to write a method findIfTransactionIsValid() which will have the array of all transactions, one sender, one receiver. A transaction is valid is following cases:
1. if sender and receiver are same
2. The timestamp should be increasing (what I mean here is if A -> B happens at Time 2 and B-> C happens at Time 1, then A->C is not a valid transaction, however if B -> C happens at Time 3 then A--> C is a valid transaction)

Example:
Transaction
{
Sender;
Receiver;
Timestamp;
}

Example: [T is timestamp here]
A -> B (T=0)
B -> C (T=1)
C -> F (T=0)

findIfTransactionIsValid(A, C) -> this should return true
findIfTransactionIsValid(B,F) -> false (time is backwards)

If the question is still not clear, please see the solution I wrote. I have written a recursive solution and is working but I am seeing help to improve the solution.

Write a retry function, continue to fetch data until u have exhausted max entries. If it fails, continue to retry until retry's have been exhausted.

There are N countries, each country has Ai players. You need to form teams of size K such that each player in the team is from a different country.
Given N and number of players from each country and size K. Find the maximum number of teams you can form.