## Add Two Numbers

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Find the number of 2s in between 0 and n

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Delete duplicate node from a Linked List

Delete kth node from linked list

Arranging k planks end-to-end means that arranging (k short, 0 long), (k-1 short, 1 long), (k-2 short, 2 long)...

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Find intersection between two linked list

(6 -> 1 -> 7) + (2 -> 9). That is 617 + 029 = 6 -> 4 -> 6

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Detect if a Linked List is circular

Check if a linked list is a palindrome

195. Palindrome Permutation: Given a string, write a function to check if it is a permutation of a palindrome.

Get all nodes from kth position to the end

An ant is sitting on an infinite grid of white and black squares. It initially faces right.

Given an array filled with letters and numbers, fnd the longest subarray with

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199. One Away insert a character,

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You are given two strings, pattern and value. The pattern string consists of just the letters a and b,

You have an integer matrix representing a plot of land, where the value at that location

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Check if one string is formed by rotating the other string eg: abcd, dabc, cdab, bcda

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Sum value of nodes

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Make INPLACE row and column of a matrix 0 iff that row contains a 0