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reverselinkedlistbetweentwonodes

Reverse a linked list from position m to n.

reversewordsinstring

romantointeger

Given a roman numeral, convert it to an integer.

rootofnumber

Many times, we need to re-implement basic functions without using any standard library functions already implemented.

rotatematrixby90degree

Rotate Matrix: Rotate the image by 90 degrees. Can you do this in place?

searchforrangeinsortedarray-binarysearch

Given an array of integers sorted in ascending order, find the starting and ending position of a given target value.

searchinrotatedsortedarray

Suppose a sorted array is rotated at some pivot unknown to you beforehand.

searchinsertposition-binarysearch

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.

shortest-distance-from-top-left-to-given-point-in-2d-grid

The area is abstracted as a grid. Not all locations are accessible by road. The truck only needs to make a single delivery.

shortestpathbinarymatrix-bfs

https://leetcode.com/problems/shortest-path-in-binary-matrix/

sortbycolor

Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent

squreroot-usingbinarysearch

Calculate Square root of integer using binary search

stackmin

Implement a min function in stack other than push and pop

string-compression

strstr

Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

substringconcatenation

You are given a string, S, and a list of words, L, that are all of the same length.

sumofthreeequaltozero

Find all combinations of 3 integers from array whose sum is equal to zero

superbalanced-binarytree

A tree is "superbalanced" if the difference between the depths of any two leaf nodes ↴ is no greater than one.

swapnodesinpairs

Given a linked list, swap every two adjacent nodes and return its head.

taskoptimization-sorting

You need to write a function, which computes the maximum number of tasks that can be completed within the given time T.

timeplanner-earliestcommontimeslot

Implement a function meetingPlanner that given the availability, slotsA and slotsB, of two people and a meeting duration dur, returns the earliest time slot that works for both of them and is of duration dur.

tree1-contains-tree2

Given two non-empty binary trees s and t, check whether tree t has exactly the same structure and node values with a subtree of s.

treeproblems

Tree traversal and other tree related problems

urlify

Write a method to replace all spaces in a string with '%20'.

validsudoku

Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.

wordbreak-dp_solution

wordcountengine

Implement a document scanning function wordCountEngine, which receives a string document and returns a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order.

wordladder

Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord, such that:

wordpattern

Given a pattern and a string str, find if str follows the same pattern.

yearwhenmaxpeoplewerealive-maxintervaloverlapproblem

Find the year when maximum number of people we alive.