02-data_structures/03-hash_tables/01-phone_book/phone_book.cpp


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#include <iostream>
#include <vector>
#include <string>

using std::string;
using std::vector;
using std::cin;

struct Query {
    string type, name;
    int number;
};

vector<Query> read_queries() {
    int n;
    cin >> n;
    vector<Query> queries(n);
    for (int i = 0; i < n; ++i) {
        cin >> queries[i].type;
        if (queries[i].type == "add")
            cin >> queries[i].number >> queries[i].name;
        else
            cin >> queries[i].number;
    }
    return queries;
}

void write_responses(const vector<string>& result) {
    for (size_t i = 0; i < result.size(); ++i)
        std::cout << result[i] << "\n";
}

vector<string> process_queries(const vector<Query>& queries) {
    vector<string> result;

    vector<string> contacts(10000000);

    for (size_t i = 0; i < queries.size(); ++i) {
        int j = queries[i].number;
        if (queries[i].type == "add") {
            contacts[j] = queries[i].name;
        } else if (queries[i].type == "del") {
            contacts[j] = "";
        } else {
            if (contacts[j].empty())
                result.push_back("not found");
            else
                result.push_back(contacts[j]);
        }
    }
    return result;
}

int main() {
    write_responses(process_queries(read_queries()));
    return 0;
}