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Competitive Programming

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Recursion

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9min

Construct Binary Tree from Postorder and Inorder Traversal

In this article, we’ll see how we are able to construct a binary tree using two basic binary tree traversals -...

2

9min

Remove Invalid Parentheses

About the problem: Here we are given a string, str, consisting of letters and parentheses only. We are to get ...

7min

N-th Tribonacci Number

About the problem: Just like the Fibonacci sequence, which can be defined as Fn = Fn-1 + Fn-2 where F[0] = 0, ...

3

9min

Reverse Node in K-Group

About the Problem: In this problem, we are provided with a linked list and an integer, k. Here we need to reve...

6min

Tower of Hanoi

The Tower of Hanoi is likely to be a popular game among mathematicians and physicists. The goal of the game is...

5

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