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Medium

Shortest Path: Coding Interview Question

Article

Coding Interview Question: Shortest Path

Coding Interview Question: Given a directed graph, find the shortest path between two nodes if one exists. Click for the solution.
Square Submatrix: Coding Interview Question

Article

Coding Interview Question: Square Submatrix

Coding Interview Question: Given a 2D array of 1s and 0s, find the largest square subarray of all 1s. Click for the solution.
Merge K Arrays: Coding Interview Question

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Coding Interview Question: Merge K Arrays

Coding Interview Question: Given k sorted arrays, merge them into a single sorted array. Click for the solution.
Remove Duplicates: Coding Interview Question

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Coding Interview Question: Dedup Linked List

Coding Interview Question: Given an unsorted linked list, write a function to remove all the duplicates. Click for the solution.
Lowest Common Ancestor: Coding Interview Question

Article

Coding Interview Question: Lowest Common Ancestor

Coding Interview Question: Given two nodes in a binary tree, write a function to find the lowest common ancestor. Click for the solution.
String Deletion: Coding Interview Question

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Coding Interview Question: String Deletion

Coding Interview Question: Given a string and a dict, find the minimum number of characters to delete to make a valid word. Click for the solution.
Matrix Search: Coding Interview Question

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Coding Interview Question: Matrix Search

Coding Interview Question: Given an sorted n x m array, write a function to determine whether the array contains an element x. Click for the solution.
Doubly Linked List: Coding Interview Question

Article

Coding Interview Question: Tree to Doubly Linked List

Coding Interview Question: Given a tree, convert it into a doubly linked list from left to right by modifying the existing pointers. Click for the solution.
Longest Branch: Coding Interview Question

Article

Coding Interview Question: Longest Consecutive Branch

Coding Interview Question: Given a tree, find the length of the longest branch of nodes in increasing consecutive order. Click for the solution.
Sort Stacks: Coding Interview Question

Article

Coding Interview Question: Sort Stacks

Coding Interview Question: Given a stack, sort the elements in the stack using one additional stack. Click for the solution.
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