救救一个只会用万能头的孩子!

#include <algorithm> //STL 通用算法#include <bitset> //STL 位集容器#include <cctype>#include <cerrno>#include <clocale>#include <cmath>#include <complex> //复数类#include <cstdio>#include <cstdlib>#include <cstring>#include <ctime>#include <deque> //STL 双端队列容器#include <exception> //异常处理类#include <fstream>#include <functional> //STL 定义运算函数（代替运算符）#include <limits>#include <list> //STL 线性列表容器#include <map> //STL 映射容器#include <iomanip>#include <ios> //基本输入／输出支持#include <iosfwd> //输入／输出系统使用的前置声明#include <iostream>#include <istream> //基本输入流#include <ostream> //基本输出流#include <queue> //STL 队列容器#include <set> //STL 集合容器#include <sstream> //基于字符串的流#include <stack> //STL 堆栈容器 #include <stdexcept> //标准异常类#include <streambuf> //底层输入／输出支持#include <string> //字符串类#include <utility> //STL 通用模板类#include <vector> //STL 动态数组容器#include <cwchar>#include <cwctype>using namespace std;