Shirley Young

Find Right Interval: Given a set of intervals, for each of the interval i, check if there exists an interval ... http://bit.ly/2ffOiNY 

Non-overlapping Intervals: Given a collection of intervals, find the minimum number of intervals you need to ... http://bit.ly/2eS2a3X 

Graph Valid Tree: Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair o... http://bit.ly/2eu2nHu 

Find All Numbers Disappeared in an Array: Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), ... http://bit.ly/2f74UZC 

Path Sum III: You are given a binary tree in which each node contains an integer value.Find the number of pat... http://bit.ly/2fb0784 

Factor Combinations: Numbers can be regarded as product of its factors. For example,8 = 2 x 2 x 2; = 2 x 4.W... http://bit.ly/2f3iu0i 

Count Univalue Subtrees: Given a binary tree, count the number of uni-value subtrees.A Uni-value subtree mean... http://bit.ly/2epNSV2 

Random Pick Index: Given an array of integers with possible duplicates, randomly output the index of a given ... http://bit.ly/2f7zT6f 

All O`one Data Structure: Implement a data structure supporting the following operations:Inc(Key) - Inserts a... http://bit.ly/2eKtbpT 

Strong Password CheckerStrong Password Checker: A password is considered strong if below conditions are all m... http://bit.ly/2epfZDS 

Longest Repeating Character Replacement: Given a string that consists of only uppercase English letters, you ... http://bit.ly/2f0r3Jc 

Decode String: Given an encoded string, return it's decoded string.The encoding rule is: k[encoded_string], w... http://bit.ly/2dZtqcC 

Battleships in a Board: Given an 2D board, count how many different battleships are in it. The battleships ar... http://bit.ly/2eXj8L1 

Partition Equal Subset Sum: Given a non-empty array containing only positive integers, find if the array can ... http://bit.ly/2fkDzFU 

Ternary Expression Parser: Given a string representing arbitrarily nested ternary expressions, calculate the ... http://bit.ly/2eNiIIB 

Word Squares: Given a set of words (without duplicates), find all word squares you can build from them.A sequ... http://bit.ly/2ewjMlB 

Longest Absolute File Path: Suppose we abstract our file system by a string in the following manner:The strin... http://bit.ly/2eMvFSW 

Valid Word Square: Given a sequence of words, check whether it forms a valid word square.A sequence of words ... http://bit.ly/2eCqzdS 

Sentence Screen Fitting: Given a rows x cols screen and a sentence represented by a list of words, find how m... http://bit.ly/2eP6I8Z 

Third Maximum Number: Given a non-empty array of integers, return the third maximum number in this array. If ... http://bit.ly/2eq7uey