214. Shortest Palindrome
You are given a string s. You can convert s to a palindrome by adding characters in front of it. Return the shortest palindrome […]
Facing the sun
Given an array height representing the heights of buildings. You have to count the buildings that will see the sunrise (Assume the
241. Different Ways to Add Parentheses
Given a string expression of numbers and operators, return all possible results from computing all the different possible ways to group numbers and
Reverse Words
Given a String str, reverse the string without reversing its individual words. Words are separated by dots. Note: The last character
179. Largest Number
Given a list of non-negative integers nums, arrange them such that they form the largest number and return it. Since the
Parenthesis Checker
Given an expression string x. Examine whether the pairs and the orders of {,},(,),[,] are correct in exp.For example, the function
884. Uncommon Words from Two Sentences
A sentence is a string of single-space separated words where each word consists only of lowercase letters. A word is uncommon if it appears
Minimize The Heights II
Given an array arr[] denoting heights of N towers and a positive integer K. For each tower, you must perform exactly one of the following operations exactly once. Increase the height
539. Minimum Time Difference
Given a list of 24-hour clock time points in “HH:MM” format, return the minimum minutes difference between any two time-points in the list. Example 1:
Longest Valid Parentheses
Given a string str consisting of opening and closing parenthesis ‘(‘ and ‘)‘. Find length of the longest valid parenthesis substring. A
1371. Find the Longest Substring Containing Vowels in Even Counts
Given the string s, return the size of the longest substring containing each vowel an even number of times. That is,
Binary Tree to DLL
Given a Binary Tree (BT), convert it to a Doubly Linked List (DLL) in place. The left and right pointers