摘要：
You are given a license key represented as a string S which consists only alphanumeric character and dashes. The string is separated into N+1 groups b 阅读全文
摘要：
In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as 阅读全文
摘要：
三种函数相关的语言特性：默认实参、内联函数、constexpr函数 默认实参 某些函数有这样一些形参，在函数的很多次调用中它们都被赋予一个相同的值，此时，我们把这个反复出现的值称为函数的默认实参。调用含有默认实参的函数时，可以包含该实参，也可以忽略该实参。 其中我们为每个形参都提供了默认实参，默认实 阅读全文