摘要:
**Given an array of integers, find two numbers such that they add up to a specific target number.**Input: numbers={2, 7, 11, 15}, target=9Output: ... 阅读全文
摘要:
Given a digit string, return all possible letter combinations that the number could represent.这里用递归,递归式举例:$f(2)=[a,b,c]$, $f(23)=[a+f(3),b+f(3),c+f(3)... 阅读全文