#include <iostream>

#include <set>

#include <vector>

using namespace std;

int main()

{

    set<int> setInt;

    vector<int> ivec;

    for(vector<int>::size_type i = 0; i != 11; ++i)

        ivec.push_back(i);

    setInt.insert(ivec.begin(), ivec.end());

    setInt.insert(11);

    set<int>::iterator itor1 = setInt.find(9);//  这个也对，为什么const类型的键值可以用非const的迭代器？？？？？

    set<int>::const_iterator itor2 = setInt.find(10);

    if(itor1 != setInt.end())

        cout << *itor1 << endl;

  /*

    *itor1 = 12;    //error：keys in a set are read-only 正如不能修改mao中元素的键部分一样，set中的键也是const，在获取迭代器后只能对其进行读操作

  */

    if(itor2 != setInt.end())

        cout << *itor2 << endl;

    system("pause");

    return 0;

}

 #include <iostream>

 #include <string>

 #include <utility>

 #include <vector>

 #include <set>

 #include <map>

 using namespace std;

 void restricted_wc( vector<string> strVec, map<string, int> &wordCount )

 {

     // create a set of excluded words

     set<string> excluded;

     for ( vector<string>::iterator it = strVec.begin(); it != strVec.end(); ++it )

     {

         excluded.insert( *it );

     }

     string word;

     cout << " Input some words to count the words in wordCount(map) ( ctrl + z to end): "

          << endl;

     cin.clear();

     while ( cin >> word )

     {

         if ( !excluded.count( word ) )

             ++wordCount[ word ];

     }

 }

 int main(int argc, char* argv[])

 {

     cout << " Input some words to vector<string> excluded ( ctrl + z to end): " << endl;

     vector<string> excludedVec;

     string excludedWord;

     while ( cin >> excludedWord )

         excludedVec.push_back( excludedWord );

    // use restricted_wc()

     map< string, int > wordCount;

     restricted_wc( excludedVec, wordCount );

     // show out the map:wordCount

     cout << "\n\tShow out the map:wordCount: " << endl;

     for ( map< string, int >::iterator it = wordCount.begin(); it != wordCount.end(); ++it )

     {

         cout << " The word '" << (*it).first << "' appears for " << (*it).second << " times. " << endl;

     }

     system("pause");

     return ;

 }