阅读下面的程序，对照运行结果，领会STL的用法
(1)

#include <string>
#include <set>
#include <iterator>
#include <iostream>
using namespace std;
int main()
{set <string> strset;strset.insert("cantaloupes");strset.insert("grapes");strset.insert("apple");strset.insert("orange");strset.insert("banana");strset.insert("grapes");copy(strset.begin(), strset.end(), ostream_iterator<string>(cout, " "));cout << endl;return 0;
}

(2)

#include <functional>
#include <numeric>
#include <vector>
#include <iostream>
using namespace std;
int main()
{vector<int> v(5);for (int i = 0; i < 5; i++)v[i] = i + 1;int sum = accumulate(v.begin(), v.end(), 0);cout << "Sum of values == " << sum << endl;int product = accumulate(v.begin(), v.end(), 1, multiplies<long>());cout << "Product of values == " << product << endl;return 0;
}

(3)

#include <algorithm>
#include <functional>
#include <vector>
#include <iostream>
#include <numeric>
#include <iterator>
using namespace std;
int main()
{int a[] = {1,4,7,2,5,8};int b[] = {1,2,3,3,2,1};const int ASZ = sizeof a / sizeof a[0];const int BSZ = sizeof b / sizeof b[0];ostream_iterator<int> out(cout,"  ");copy(a, a + ASZ, out);cout<<endl;copy(b, b + BSZ, out);cout<<endl;int r = accumulate(a, a + ASZ, 0);cout << "accumulate 1: " << r << endl;// Should produce the same result:r = accumulate(b, b + BSZ, 0, plus<int>());cout << "accumulate 2: " << r << endl;r = inner_product(a, a + ASZ, b, 0);// 或  r = inner_product(a, a + ASZ, b, 0, plus<int>(), multiplies<int>());cout << "inner_product : " << r << endl;int* it = partial_sum(a, a + ASZ, b);// 或 int* it = partial_sum(a, a + ASZ, b, plus<int>());copy(b, it, out);cout<<endl;it = adjacent_difference(a, a + ASZ, b);// 或 it = adjacent_difference(a, a + ASZ, b, minus<int>());copy(b, it, out);cout<<endl;return 0;
}

(4)

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
#include <iterator>
using namespace std;
class myAdd: public binary_function<int,int,int>
{
public:int operator()(int a, int b) const{return a+b;}
};
int main()
{int a[5]= {1,2,3,4,5};vector<int> my(5);transform(a,a+5,my.begin(), bind2nd(myAdd(), 4));copy(my.begin(), my.end(), ostream_iterator<int>(cout, " "));cout<<endl;transform(a,a+5,a,my.begin(), myAdd());copy(my.begin(), my.end(), ostream_iterator<int>(cout, " "));cout<<endl;return 0;
}

(5)

#include <iterator>
#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
using namespace std;
class Angle
{int degrees;
public:Angle(int deg) : degrees(deg) {}int mul(int times){return degrees *= times;}
};
int main()
{int x[] = {1, 2, 4, 5, 8};vector<Angle> va;for(int i =10; i <= 50; i += 10)va.push_back(Angle(i));transform(va.begin(), va.end(), x, ostream_iterator<int>(cout , "  "), mem_fun_ref(&Angle::mul));cout << endl;return 0;
}

(6)

#include <string>
#include <iostream>
#include <map>
using namespace std;
class CStudent
{
public :int nStudentID;int nAge;
public :CStudent()  {  }CStudent(int nSID, int nA){nStudentID=nSID;nAge=nA;}//复制构造函数CStudent(const CStudent& ob) {nStudentID=ob.nStudentID;nAge=ob.nAge;}
};
int main()
{map <string, CStudent> mapStudent;mapStudent["zhangsan"] = CStudent(100012, 22);mapStudent["Lisi"] = CStudent(100085, 21);mapStudent["Wangwu"] = CStudent(100093, 23);cout << "The Student number for Lisi  is " <<(mapStudent["Lisi"].nStudentID) << endl;return 0;
}