https://blog.csdn.net/breeze5428/article/details/25918925
参考网页：
http://en.cppreference.com/w/cpp/algorithm/min_element
主要有两种用法
template< class ForwardIt >
ForwardIt min_element( ForwardIt first, ForwardIt last );
和
template< class ForwardIt, class Compare >
ForwardIt min_element( ForwardIt first, ForwardIt last, Compare comp );
。其中第一种采用默认的比较函数<，第二种自定义比较函数。first和last是被比较的元素的地址或迭代器范围 [ first,last)。以下是一个具体的实例。
// min_element/max_element example
#include <iostream> // std::cout
#include <algorithm> // std::min_element, std::max_element
bool myfn(int i, int j) { return i<j; }
struct myclass {
bool operator() (int i,int j) { return i<j; }
} myobj;
int main () {
int myints[] = {3,7,2,5,6,4,9};
// using default comparison:
std::cout << "The smallest element is " << *std::min_element(myints,myints+7) << '\n';
std::cout << "The largest element is " << *std::max_element(myints,myints+7) << '\n';
// using function myfn as comp:
std::cout << "The smallest element is " << *std::min_element(myints,myints+7,myfn) << '\n';
std::cout << "The largest element is " << *std::max_element(myints,myints+7,myfn) << '\n';
// using object myobj as comp:
std::cout << "The smallest element is " << *std::min_element(myints,myints+7,myobj) << '\n';
std::cout << "The largest element is " << *std::max_element(myints,myints+7,myobj) << '\n';
return 0;
}
