Push your limit!

摘要： On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, or; D 阅读全文

摘要： Your task is to form an integer array nums from an initial array of zeros arr that is the same size as nums. Return the minimum number of function cal 阅读全文

摘要： Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. Th 阅读全文

摘要： In universe Earth C-137, Rick discovered a special form of magnetic force between two balls if they are put in his new invented basket. Rick has n emp 阅读全文

摘要： Start from integer 1, remove any integer that contains 9 such as 9, 19, 29... So now, you will have a new integer sequence: 1, 2, 3, 4, 5, 6, 7, 8, 10 阅读全文

摘要： Given a string s. An awesome substring is a non-empty substring of s such that we can make any number of swaps in order to make it palindrome. Return 阅读全文

摘要： There are G people in a gang, and a list of various crimes they could commit. The i-th crime generates a profit[i] and requires group[i] gang members 阅读全文

摘要： Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n. Example: Input: 13 Output: 6 Exp 阅读全文

摘要： Given a m x n binary matrix mat. In one step, you can choose one cell and flip it and all the four neighbours of it if they exist (Flip is changing 1 阅读全文

摘要： Given an array of positive integers target and an array initial of same size with all zeros. Return the minimum number of operations to form a target  阅读全文