680. Valid Palindrome II

2018-08-18

Problem description:

Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome.

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314. Binary Tree Vertical Order Traversal

2018-08-17

Problem description:

Given a binary tree, return the vertical order traversal of its nodes’ values. (ie, from top to bottom, column by column).

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301. Remove Invalid Parentheses

2018-08-17

Problem description:

Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.

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273. Integer to English Words

2018-08-16

Problem description:

Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 2^31 - 1.

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17. Letter Combinations of a Phone Number

2018-08-16

Problem description:

Given a digit string, return all possible letter combinations that the number could represent.

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152. Maximum Product Subarray

2018-08-15

Problem description:

Find the contiguous subarray within an array (containing at least one number) which has the largest product.

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516. Longest Palindromic Subsequence

2018-08-13

Problem description:

Given a string s, find the longest palindromic subsequence’s length in s. You may assume that the maximum length of s is 1000.

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647. Palindromic Substrings

2018-08-13

Problem description:

Given a string, your task is to count how many palindromic substrings in this string.

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227. Basic Calculator II

2018-08-11

Problem description:

Implement a basic calculator to evaluate a simple expression string.

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332. Reconstruct Itinerary

2018-08-10

Problem description:

Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tickets belong to a man who departs from JFK. Thus, the itinerary must begin with JFK.

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