Bloomberg Software Developer Internship interview questions

Given a word, rearrange the letters so that they appear by decreasing frequency. In the case of a tie, sort the letters by increasing alphabetical order.

write a function to check if two strings are substrings of each other (either first is substring of second or vice versa). write a function to check if two strings are anagrams of each other. The interview was 45 minutes and we didn't have time to code the seconds question so i discussed the two solutions and analyzed their time and space complexities.