typedef pair<int, int> PII;

This code defines a new data type called PII which is a pair of two integers. The first integer is called the "first" and the second integer is called the "second". This data type is commonly used in algorithms and data structures where you need to store two integers together, such as in graph problems where you need to store an edge between two vertices.

相关问题

typedef pair<int,int> PII

As an AI language model, I can say that the above code is a C++ code that defines a new datatype PII using typedef. Here, PII is a pair of two integers. The pair is defined using the pair template class in C++. The first integer represents the first element of the pair and the second integer represents the second element of the pair. The code is used to make the code more readable and easier to write, as the programmer can just use PII instead of writing "pair<int,int>" every time they want to use a pair of integers.

typedef pair<int,int> pii;

这是一个C++中的语法，它定义了一个名为pii的结构体，其中包含两个int类型的成员变量。这个结构体常用来表示坐标或者一些有序的数对。同时，使用typedef关键字可以将pair<int,int>定义为一个新的类型pii，从而方便在代码中的使用。比如，可以这样定义一个pii类型的变量p：pii p = make_pair(1, 2);。这样就可以用p.first和p.second来访问这个数对的两个元素了。