mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#include <sprout/array.hpp>
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#include <sprout/string.hpp>
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#include <sprout/utility.hpp>
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#include <sprout/container.hpp>
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#include <sprout/range.hpp>
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#include <sprout/range/algorithm.hpp>
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#include <sprout/range/adaptor.hpp>
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static constexpr auto token_table = sprout::make_array<sprout::string<8> >(
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"Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz", "FizzBuzz",
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"Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz"
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);
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static constexpr auto index_table = sprout::make_array<int>(
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3, 5, 6, 9, 10, 12, 15,
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18, 20, 21, 24, 25, 27
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);
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template<typename ForwardRange, typename Difference>
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constexpr sprout::pair<int, int>
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inv_fizzbuzz_impl(ForwardRange const& rng, Difference found) {
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return found == sprout::size(token_table) ? sprout::pair<int, int>{0, 0}
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: sprout::pair<int, int>{
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index_table[found],
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sprout::size(rng) / 7 * 15 + index_table[found + sprout::size(rng) % 7 - 1]
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}
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;
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}
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template<typename ForwardRange>
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constexpr sprout::pair<int, int>
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inv_fizzbuzz(ForwardRange const& rng) {
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return sprout::size(rng) <= 7
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|| (sprout::size(sprout::range::find_end<sprout::range::return_found_end>(rng, rng | sprout::adaptors::taken(7))) == 7 + sprout::size(rng) % 7
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&& sprout::range::equal(
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rng | sprout::adaptors::taken(sprout::size(rng) % 7),
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rng | sprout::adaptors::dropped(sprout::size(rng) - sprout::size(rng) % 7)
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)
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)
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? inv_fizzbuzz_impl(
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rng,
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sprout::size(sprout::range::search<sprout::range::return_begin_found>(token_table, rng | sprout::adaptors::taken(7)))
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)
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: sprout::pair<int, int>{0, 0}
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;
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}
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#include <iostream>
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template<typename ForwardRange, typename Pair>
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void print(ForwardRange const& input, Pair const& answer) {
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std::cout << "input : ";
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for (auto const& e : input) {
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std::cout << e << ' ';
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}
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std::cout << std::endl;
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std::cout << "answer: (" << answer.first << ',' << answer.second << ')' << std::endl;
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}
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int main() {
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{
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constexpr auto input = sprout::make_array<sprout::string<8> >(
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"Fizz", "FizzBuzz", "Fizz", "Buzz"
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);
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constexpr auto answer = inv_fizzbuzz(input);
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static_assert(answer.first == 12 && answer.second == 20, "answer is (12,20)");
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print(input, answer);
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}
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{
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constexpr auto input = sprout::make_array<sprout::string<8> >(
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"FizzBuzz", "Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz",
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"FizzBuzz", "Fizz", "Buzz", "Fizz", "Fizz", "Buzz", "Fizz",
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"FizzBuzz", "Fizz", "Buzz"
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);
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constexpr auto answer = inv_fizzbuzz(input);
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static_assert(answer.first == 15 && answer.second == 50, "answer is (15,50)");
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print(input, answer);
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}
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{
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constexpr auto input = sprout::make_array<sprout::string<8> >(
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"Fizz", "FizzBuzz", "Buzz"
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);
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constexpr auto answer = inv_fizzbuzz(input);
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static_assert(answer.first == 0 && answer.second == 0, "answer is (0,0)");
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print(input, answer);
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}
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}
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