#include <cassert>
#include <cstdint>
#include <sstream>
#include <string>

using Int = std::int32_t;

bool deserialize(const std::string &s, Int expected_opcode, Int expected_item_id, Int expected_item_count) noexcept
{
    std::string delimeter = " ";

    auto s1 = s.substr(1, s.find(delimeter));
    auto s2 = s.substr(2, s.find(delimeter));

    auto item_id = static_cast<Int>(std::stoi(s1));
    auto item_count = static_cast<Int>(std::stoi(s2));

    std::istringstream error_check1(s1);
    std::istringstream error_check2(s2);

    if (!error_check1.eof() || !error_check2.eof())
    {
        return false;
    }

    if (item_id != expected_item_id || item_count != expected_item_count)
    {
        return false;
    }

    return true;
}

int main()
{
    assert(deserialize("123 456 789\0", 123, 456, 789));
    assert(!deserialize("123 456 789", 123, 456, 789));
    assert(!deserialize("", -1, -1, -1));
    assert(!deserialize("\0", -1, -1, -1));
    assert(!deserialize("123", 123, -1, -1));
    assert(!deserialize("123\0", 123, -1, -1));
    assert(!deserialize("123 456\0", 123, 456, -1));
    assert(!deserialize("123 456", 123, 456, -1));

    return 0;
}