James Pan

原题网址：https://leetcode.com/problems/different-ways-to-add-parentheses/Given a string of numbers and operators, return all possible results from computing all the different possible ways to group

原题网址：https://leetcode.com/problems/combination-sum-ii/Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to

原题网址：https://leetcode.com/problems/combinations/Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.For example,If n = 4 and k = 2, a solution is:[

原题网址：https://leetcode.com/problems/coin-change/You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you

原题网址：https://leetcode.com/problems/subsets-ii/Given a collection of integers that might contain duplicates, nums, return all possible subsets.Note:Elements in a subset must be in non-d

原题网址：https://leetcode.com/problems/restore-ip-addresses/Given a string containing only digits, restore it by returning all possible valid IP address combinations.For example:Given "2552551

原题网址：https://leetcode.com/problems/unique-binary-search-trees/Given n, how many structurally unique BST's (binary search trees) that store values 1...n?For example,Given n = 3, there are a

原题网址：https://leetcode.com/problems/generate-parentheses/Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a sol

原题网址：https://leetcode.com/problems/integer-break/Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximu

原题网址：https://leetcode.com/problems/combination-sum/Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The

原题网址：https://leetcode.com/problems/letter-combinations-of-a-phone-number/Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to l

原题网址：https://leetcode.com/problems/find-the-celebrity/Suppose you are at a party with n people (labeled from 0 to n - 1) and among them, there may exist one celebrity. The definition of a cele

原题网址：https://leetcode.com/problems/expression-add-operators/Given a string that contains only digits 0-9 and a target value, return all possibilities to add binary operators (not unary) +, -,

原题网址：https://leetcode.com/problems/3sum-smaller/Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0  that satisfy the condition nums[i] + nums[j]

原题网址：https://leetcode.com/problems/palindrome-permutation-ii/Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permut

原题网址：https://leetcode.com/problems/largest-number/Given a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest

原题网址：https://leetcode.com/problems/subsets/Given a set of distinct integers, nums, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution se

原题网址：https://leetcode.com/problems/create-maximum-number/Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k  from digits of th

原题网址：https://leetcode.com/problems/combination-sum-iii/Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combinati

原题网址：https://leetcode.com/problems/unique-substrings-in-wraparound-string/Consider the string s to be the infinite wraparound string of "abcdefghijklmnopqrstuvwxyz", so s will look like this: