Function ExtractDigits

tests/test_support.cpp:204–212

}

std::wstring ExtractDigits(const std::wstring &text) {
    std::wstring digits;
    digits.reserve(text.size());
    for (wchar_t ch : text) {
        if (ch >= L'0' && ch <= L'9')
            digits.push_back(ch);
    }
    return digits;
}

size_t EditDistance(const std::wstring &lhs, const std::wstring &rhs) {
    std::vector<size_t> prev(rhs.size() + 1);