Junior Trainee Engineer

You are given a string str consisting of lowercase English letters and an integer K.

Your task is to find the length of the longest substring of str in which every character appears at least K times.

In a grand ceremony, 'N' scholars, each holding a unique book, are to exchange their books among themselves.

A valid exchange is a permutation of books where any scholar is part of an exchange cycle of at most length 3. This means a scholar can either:

1) Keep their own book (a cycle of length 1).

2) Swap books with one other scholar (a cycle of length 2).

3) Participate in a three-way exchange (a cycle of length 3).

Your task is to find the total number of distinct, valid book exchange arrangements possible for 'N' scholars. Since the number can be very large, you must return the result modulo 1,000,000,007.

You are given a string s. Your task is to calculate the frequency of each character present in the string and print the results.

The output must follow these specific rules:

1) The character counting is case-sensitive (e.g., 'a' and 'A' are considered different characters).

2) Any spaces (' ') in the input string must be ignored.

3) The final frequencies must be printed in alphabetical order of the characters.

Linux Commands: grep, sed, awk, process management, file permissions.

Tell me about yourself and your family.

Are you open to relocation? Do you have any restrictions on where you can work?

What is something not mentioned on your resume that we should know about?

Where do you see yourself in the next few years?

Tell me about a failure you faced and how you handled it.

What do you value more – success or learning from failures?