практика_сеты3_14

#include <set>
#include <fstream>
#include <algorithm>
#include <vector>
#include <string>
#include <iterator>

using namespace std;

int main()
{
        set <string> s1;
        set <string> s2;
        vector <string> res;
        string tmp;
        ifstream in("input.txt");
        ofstream out("output.txt");
        string temp;
        getline(in, tmp);
        int i = 0;
        while (!tmp.empty())
        {
            if (tmp[i] == '?')
            {
                temp = tmp.substr(0, tmp.find('?'));
                tmp.erase(0, tmp.find('?')+2);
                while (!temp.empty())
                {
                    s1.insert(temp.substr(0, temp.find(" ")));
                    temp.erase(0, temp.substr(0, temp.find(" ")).length() + 1);
                }
                i = 0;
            }
            else if (tmp[i] == '!')
            {
                temp = tmp.substr(0, tmp.find('!'));
                tmp.erase(0, tmp.find('!')+2);
                while (!temp.empty())
                {
                    s2.insert(temp.substr(0, temp.find(" ")));
                    temp.erase(0, temp.substr(0, temp.find(" ")).length() + 1);
                }
                i = 0;
            }
            else if(tmp[i] == '.')
            {
                tmp.erase(0, tmp.find('.')+2);
                i = 0;
            }

            else i++;
        }
        set_intersection(s1.begin(), s1.end(), s2.begin(), s2.end(), back_inserter(res));
        out << res.size() << endl;
        for (vector <string>::iterator iter = res.begin(); iter != res.end(); iter++)
        out << *iter << " ";
        if (res.empty())
                out << "There is no similar words in exclamation and interrogative sentences!";
        in.close();
        out.close();
        return 0;
}