Backend Developer

Count the number of substrings which contains at least one occurrence of all these characters: a, b, and c.

Note:

The count of substrings will always fit in a 32-bit integer. 

Example:

For 'n' = 5, 's’ = “abbac”.
Answer is 3.
These are the only 3 valid substrings { “abbac”, ”bbac”, ”bac” } satisfying all the constraints.

You have been given two arrays, 'AT' and 'DT', representing the arrival and departure times of all trains that reach a railway station.

Your task is to find the minimum number of platforms required for the railway station so that no train needs to wait.

Note :

1. Every train will depart on the same day and the departure time will always be greater than the arrival time. For example, A train with arrival time 2240 and departure time 1930 is not possible.

2. Time will be given in 24H format and colons will be omitted for convenience. For example, 9:05AM will be given as "905", or 9:10PM will be given as "2110".

3. Also, there will be no leading zeroes in the given times. For example, 12:10AM will be given as “10” and not as “0010”.

Given two strings, 'S' and 'T' with lengths 'M' and 'N', find the length of the 'Longest Common Subsequence'.

For a string 'str'(per se) of length K, the subsequences are the strings containing characters in the same relative order as they are present in 'str,' but not necessarily contiguous. Subsequences contain all the strings of length varying from 0 to K.

Example :

Subsequences of string "abc" are:  ""(empty string), a, b, c, ab, bc, ac, abc.

Ninja was very fond of patterns. For a given integer ‘N’, he wants to make the N-Star Triangle.

Example:

Input: ‘N’ = 3

Output: 

  *
 ***
*****

Friend Function, Virtual Function, Polymorphism, Encapsulation, etc.

Asked to write a query to retrieve the details of employees whose current salary is greater than their previous month's salary.

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