Tiger's leetcode solution

Q: Given a singly linked list, return a random node's value from the linked list. Each node must have the  same probability  of being...

Q: Given a set of  distinct  positive integers, find the largest subset such that every pair (S i , S j ) of elements in this subset satis...

Given the  root  of a binary tree, return  the sum of all left leaves. A  leaf  is a node with no children. A  left leaf  is a leaf that is ...

Q: Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples:...

Q: Given two strings  s  and  t  which consist of only lowercase letters. String  t  is generated by random shuffling string  s  and the...

Q: Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that wil...

Q: We are playing the Guess Game. The game is as follows: I pick a number from  1  to  n . You have to guess which number I picked. ...