Devoteam Data Engineer interview questions

Very heavy on algorithms & data structures.

Second Round: 1. Find all integers x, y (x >= 0, y >= 0) solutions of a diophantine equation of the form x ^ 2 - 4 * y ^ 2 = A 2. Write a function named first_non_repeating_letter that takes a string input, and returns the first character that is not repeated anywhere in the string. 3. Simple JOIN with COUNT Third Round 1. The interviewer gave a table with some sample data. The task was to give the best Data Structure solution in order to find a specific data efficiently.