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The Awesome Java feed

LRU Cache Implementation in Java

Article Added by: TechBlogStation // techblogstation.com

Identical Binary Trees (Same Tree) problem

Given two binary trees, write a function to check if they are the same or not.

Two binary trees are considered the same if they are structurally identical and the nodes have the same value.

Article Added by: callicoder // www.callicoder.com

Valid Parentheses problem

Given a string containing just the characters (, ), {, }, [ and ], determine if the input string is valid.

An input string is valid if:

Open brackets must be closed by the same type of brackets.

Article Added by: callicoder // www.callicoder.com

Merge Two Sorted Linked Lists

Merge two sorted linked lists and return it as a new list. The new list should also be sorted.

Article Added by: callicoder // www.callicoder.com

Spring Boot Actuator Complete Tutorial with Example

Article Added by: TechBlogStation // techblogstation.com

Longest Palindromic Substring

Given a string s, find the longest palindromic substring in s.

Article Added by: callicoder // www.callicoder.com

Maximum Contiguous Subarray Sum

Given an integer array numbers, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.

Article Added by: callicoder // www.callicoder.com

Add two numbers represented using Linked Lists

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

You may assume the two numbers do not contain any leading zero, except the number 0 itself.

Article Added by: callicoder // www.callicoder.com

Design and implement a data structure for Least Recently Used (LRU) cache

Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:
get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.
put(key, value) - Set or insert the value for the given key in the cache. When the cache has reached its capacity, it should invalidate the least recently used item before inserting a new item.
The cache is initialized with a positive capacity.

Article Added by: callicoder // www.callicoder.com