# Write a program to reverse singly linked list in group of k elements

In our previous article we learnt how to reverse linked list. In this article, we will learn program to reverse singly linked list in group of k elements. This is one of the most important interview question.

# Write a program to print all valid combinations of n-pairs of parentheses

This is one of the most important interview question. In this article, we will learn program to print all valid combinations of n-pairs of parentheses.

# Write a function to return minimum and maximum in an array

This is one of the most important interview question related to array. In this article, we will learn to write a function to return minimum and maximum in an array

# Suppose we have an array a1, a2, ..., an, b1, b2, ..., bn. Write a program to convert this array to a1, b1, a2, b2, ..., an, bn

This is one of the most important interview question related to array/matrix. In this article we will learn to write a program to merge two arrays of equal size in alternative form.

# Write a function to reverse an array in subset of N

This is one of the most important interview question related to array. In this article we will learn to write a function which will reverse array in subset of N.

# Write a program to find the first non-repeated (unique) character in a given string

In this article, we will understand how to write a program to find the first non-repeated (unique) character in a given string. This is one of the most repeated amazon interview question. Let us understand the approach to solve the problem in detail.

# Write a function that returns the Run Length Encoded string for the input string

In this article, we will understand how to write a function that returns the Run Length Encoded string for the input string. This is very common interview question asked in various interviews. Let us understand the logic and implementation of above problem statement