将矢量元素插入集合，同时打印集合元素得到编译问题 c++98

Question

我正在将矢量值插入到集合中。之后，我试图在遇到编译问题时打印设置值。请帮助我理解我做错了什么。

code:

#include<iostream>
#include<set>
#include<vector>

using namespace std;

int main()
{
   set<string> s1;
   vector<string> v1;
   v1.push_back("Hello");
   v1.push_back("Hello");
   v1.push_back("Hi");
   v1.push_back("Hi");
   v1.push_back("Cya");

   for(int i=0; i<v1.size(); i++)
   {
      s1.insert(v1[i]);
   }

   for(int i= 0; i<s1.size(); i++)
   {
       cout<<s1[i]<<endl;
   }

   return 0;
}

compilation error:
 error: no match for ‘operator[]’ (operand types are ‘std::set<std::basic_string<char> >’ and ‘int’)
        cout<<s1[i]<<endl;

Answer 1

您使用迭代器接口：

for (std::set<std::string>::const_iterator it = s1.begin(), end = s1.end();
     it != end; ++it) {
  std::cout << *it << '\n';
}

您也可以使用 std::copy:

std::copy(s1.begin(), s1.end(),
          std::ostream_iterator<std::string>(std::cout, "\n"));

将矢量元素插入集合，同时打印集合元素得到编译问题 c++98

Inserting elements of vector into set, while printing set elements gets compilation issue c++98

c++

stl

vector

set

c++98