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Medium

Longest Common Substring: Coding Interview Question

Article

Coding Interview Question: Longest Common Substring

Coding Interview Question: Given two strings, write a function that returns the longest common substring. Click for the solution.
Stack from Queues: Coding Interview Question

Article

Coding Interview Question: Stack from Queues

Coding Interview Question: Implement a LIFO stack with basic functionality (push and pop) using FIFO queues to store the data. Click for the solution.
Balanced Binary Tree: Coding Interview Question

Article

Coding Interview Question: Balanced Binary Tree

Coding Interview Question: Given a binary tree, write a function to determine whether the tree is balanced. Click for the solution.
Zero Sum Subarray: Coding Interview Question

Article

Coding Interview Question: Zero Sum Subarray

Coding Interview Question: Given an array, write a function to find any subarray that sums to zero, if one exists. Click for the solution.
Three Sum: Coding Interview Question

Article

Coding Interview Question: Three Sum

Coding Interview Question: Given a list of integers, find all sets of 3 numbers in the list, a, b, and c, so that a + b + c == 0. Click for the solution.
Permutations: Coding Interview Question

Article

Coding Interview Question: Permutations

Coding Interview Question: Write a function that returns all permutations of a given list. Click for the solution.
Tree Level Order: Coding Interview Question

Article

Coding Interview Question: Tree Level Order

Coding Interview Question: Given a tree, write a function that prints out the nodes of the tree in level order. Click for the solution.
Kth Most Frequent: Coding Interview Question

Article

Coding Interview Question: Kth Most Frequent String

Coding Interview Question: Given a list of strings, write a function to get the kth most frequently occurring string. Click for the solution.
Binary Tree Validation: Coding Interview Question

Article

Coding Interview Question: Binary Search Tree Verification

Coding Interview Question: Given a binary tree, write a function to test if the tree is a binary search tree. Click for the solution.
Max Stack: Coding Intervie Question

Article

Coding Interview Question: Max Stack

Coding Interview Question: Implement a stack that has a max() function, where max() returns the maximum value in the stack. Click for the solution.
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