摘要： Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen nu 阅读全文

摘要： The count-and-say sequence is a sequence of digit strings defined by the recursive formula: countAndSay(1) = "1" countAndSay(n) is the way you would " 阅读全文

摘要： Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: Each of the digits 1-9 阅读全文