leetcode/

https://leetcode.com/problems/add-to-array-form-of-integer/description/ For a non-negative integer X, the array-form of X is an array of its digits in left to right order.

https://leetcode.com/problems/number-of-1-bits/ Write a function that takes an unsigned integer and return the number of '1' bits it has (also known as the Hamming weight).

https://leetcode.com/problems/climbing-stairs/#/description ou are climbing a stair case.

https://leetcode.com/problems/find-common-characters/description/ Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (including duplicates).

https://leetcode.com/problems/add-two-numbers/#/description You are given two non-empty linked lists representing two non-negative integers.

https://leetcode.com/problems/palindrome-number/#/description Determine whether an integer is a palindrome.

https://leetcode.com/problems/poor-pigs/description/ There are 1000 buckets, one and only one of them contains poison, the rest are filled with water.

https://leetcode.com/problems/min-stack/#/description Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

https://leetcode.com/problems/add-binary/#/description Given two binary strings, return their sum (also a binary string).

https://leetcode.com/problems/increasing-order-search-tree/ Given a tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, \ and every node has no left child and only 1 right child.