page_74_default_stack

/*4. Ñîçäàòü  ñïèñîê  èç  ñëîâ.  Ïîäñ÷èòàòü,  ñêîëüêî  ñëîâ  íà÷èíàåòñÿ
íà  äàííóþ  áóêâó.
Ñîçäàòü èç íèõ íîâûé ñïèñîê, óäàëèâ èõ èç èñõîäíîãî ñïèñêà.*/

#include <fstream>
#include <string>
#include <stack>
using namespace std;
int main(){
    stack<string> s1;
    stack<string> s2;
    string str, a;
    int cnt = 0;
    ifstream in ("input.txt");
    ofstream out ("output.txt");
    in >> a;
    while (in >> str){
        s1.push(str);
        if (str.find_first_of(a) < string::npos) cnt++;  }
    in.close();
    while (!s1.empty()){
        string q = s1.top();
        if (q.find_first_of(a) != string::npos){ s1.pop(); continue;} else s2.push(q);
        s1.pop();
    }
    while (!s2.empty()){
        out << s2.top() << ' ';
        s2.pop();}
    out << '\n' << "Count = " << cnt << endl;
    out.close();
    return 0;
}