mirror of
https://github.com/bolero-MURAKAMI/Sprout
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99 lines
3.8 KiB
C++
99 lines
3.8 KiB
C++
#ifndef SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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#define SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/iterator/type_traits/common.hpp>
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#include <sprout/functional/equal_to.hpp>
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#include <sprout/functional/bind2nd.hpp>
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#include <sprout/algorithm/count_if.hpp>
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace detail {
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool
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is_permutation_impl_ra(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1,
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RandomAccessIterator2 first2, RandomAccessIterator2 last2,
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BinaryPredicate pred,
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typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot
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)
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{
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return pivot == 0 ? sprout::count_if(first1, last1, sprout::bind2nd(pred, *first1))
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<= sprout::count_if(first2, last2, sprout::bind2nd(pred, *first1))
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: sprout::detail::is_permutation_impl_ra(
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first1, last1, first2, last2,
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pred, pivot / 2
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)
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&& sprout::detail::is_permutation_impl_ra(
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sprout::next(first1, pivot), last1, first2, last2,
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pred, (NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1) - pivot) / 2
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)
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;
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool
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is_permutation(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, BinaryPredicate pred,
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std::random_access_iterator_tag*
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)
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{
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return first1 == last1 ? true
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: sprout::detail::is_permutation_impl_ra(
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first1, last1, first2, sprout::next(first2, NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1)),
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pred, NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1) / 2
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)
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;
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}
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// Copyright (C) 2011 RiSK (sscrisk)
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool
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is_permutation_impl(
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ForwardIterator1 first1, ForwardIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2,
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BinaryPredicate pred
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)
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{
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return first1 == last1 ? true
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: sprout::count_if(first1, last1, sprout::bind2nd(pred, *first1))
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<= sprout::count_if(first2, last2, sprout::bind2nd(pred, *first1))
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&& sprout::detail::is_permutation_impl(sprout::next(first1), last1, first2, last2, pred)
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;
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool
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is_permutation(
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ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2, BinaryPredicate pred,
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void*
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)
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{
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return sprout::detail::is_permutation_impl(
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first1, last1, first2, sprout::next(first2, NS_SSCRISK_CEL_OR_SPROUT::distance(first1, last1)), pred
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);
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}
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} // namespace detail
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// 25.2.12 Is permutation
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//
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// recursion depth:
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// [first1, last1), first2 are RandomAccessIterator -> O(log N)
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// otherwise -> O(N^2)
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//
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR bool
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is_permutation(ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2, BinaryPredicate pred) {
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typedef typename sprout::common_iterator_category<ForwardIterator1, ForwardIterator2>::type* category;
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return sprout::detail::is_permutation(first1, last1, first2, pred, category());
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}
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template<typename ForwardIterator1, typename ForwardIterator2>
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inline SPROUT_CONSTEXPR bool
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is_permutation(ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2) {
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return sprout::is_permutation(first1, last1, first2, sprout::equal_to<>());
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_IS_PERMUTATION_HPP
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