Description

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.

Description

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

1. 行为型模式总结

1. 访问者模式概述

1. 模板方法概述

1. 策略模式概述

1. 状态模式概述

1. 观察者模式概述

1. 备忘录模式概述

1. 中介者模式概述