01. Old Books

#include <iostream>
#include <string>

using namespace std;

int main() {
    string book, input;
    getline(cin, book);
    getline(cin, input);

    int counter = 0;

    while (input != "No More Books" && input != book) {
        counter++;
        getline(cin, input);
    }

    if (input == "No More Books") {
        cout << "The book you search is not here!\nYou checked " << counter << " books.";
    }
    else {
        cout << "You checked " << counter << " books and found it.";
    }

    return 0;
}

Решение с for тернарен оператор:

#include <iostream>
#include <string>

using namespace std;

int main() {
    string book, input;
    getline(cin, book);

    for (int i = 0; i < 2147483647; i++) {   // INT_MAX = 2147483647
        getline(cin, input);

        if (input == "No More Books" || input == book) {

            input == book ?
                cout << "You checked " << i << " books and found it." :
                cout << "The book you search is not here!\nYou checked " << i << " books.";
            break;
        }
    }

    return 0;
}