[C++知识库]C++STL算法 is_sorted是否按照从小到大的顺序排列

有一群学生排着队，现在知道每一个人的学号，需要确认学号是否按照从小到大的顺序排列好了

在本例中，学号为"210103"的有两个人，但是不影响结果

#include<iostream>
#include<cstdlib>
#include<string>
#include<vector>
#include<algorithm>

class Student
{
private:
	std::string stu_no;
	std::string name;
public:
	explicit Student(std::string stu_no, std::string name) :stu_no(stu_no), name(name) {}
	bool operator<(const Student& stu) { return stoi(this->stu_no) < stoi(stu_no); }
};

using namespace std;

int main()
{
	vector<Student> stuVec;
	stuVec.push_back(Student("210101", "王二"));
	stuVec.push_back(Student("210102", "张三"));
	stuVec.push_back(Student("210103", "李四"));
	stuVec.push_back(Student("210103", "李五"));
	stuVec.push_back(Student("210104", "麻六"));

	bool result = is_sorted(stuVec.begin(), stuVec.end());
	if (result) {
		cout << "学号按照从小到大的顺序排列好了" << endl;
	}
	else
	{
		cout << "学号有点混乱" << endl;
	}

	return EXIT_SUCCESS;
}