std::minmax_element

 

C++

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Libreria di Utilità

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Algoritmi

Iteratori

Libreria matematca

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Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Algoritmo libreria

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Non modifica le operazioni di sequenza Original: Non-modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
Modifica delle operazioni di sequenza Original: Modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
Partizionamento operazioni Original: Partitioning operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
Ordinamento delle operazioni (su intervalli ordinati) Original: Sorting operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
Binarie (le operazioni di ricerca sui campi ordinati) Original: Binary search operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
lower_bound upper_bound	binary_search equal_range
Impostare le operazioni (su intervalli ordinati) Original: Set operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
merge inplace_merge includes	set_difference set_intersection set_symmetric_difference set_union
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is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
Minimo / massimo le operazioni Original: Minimum/maximum operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
max max_element min min_element minmax (C++11) minmax_element (C++11)	lexicographical_compare is_permutation (C++11) next_permutation prev_permutation
Operazioni numeriche Original: Numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
iota (C++11) accumulate inner_product	adjacent_difference partial_sum
Libreria C Original: C library The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
qsort	bsearch

 

Defined in header <algorithm>
template<class ForwardIt > std::pair<ForwardIt,ForwardIt>     minmax_element( ForwardIt first, ForwardIt last );	(1)
template<class ForwardIt, class Compare > std::pair<ForwardIt,ForwardIt>     minmax_element( ForwardIt first, ForwardIt last, Compare comp );	(2)

Trova il più grande e il più piccolo elemento nel [first, last) gamma. La prima versione utilizza operator< per confrontare i valori, la seconda versione utilizza la funzione di confronto dato comp.

Original:

Finds the greatest and the smallest element in the range [first, last). The first version uses operator< to compare the values, the second version uses the given comparison function comp.

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Parametri

first, last	-	iteratori forward che definiscono l'intervallo di esaminare Original: forward iterators defining the range to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
cmp	-	comparison function which returns ​true if if *a is less than *b. The signature of the comparison function should be equivalent to the following:  bool cmp(const Type1 &a, const Type2 &b); The signature does not need to have const&, but the function must not modify the objects passed to it. The types Type1 and Type2 must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to both of them. ​
Type requirements
- ForwardIt must meet the requirements of ForwardIterator.

Valore di ritorno

una coppia costituita da un iteratore al più piccolo elemento come primo elemento ed un iteratore al più grande come il secondo elemento. Restituisce std::make_pair(first, first) se il campo è vuoto. Se alcuni elementi sono equivalenti al più piccolo elemento, l'iteratore al primo elemento tale viene restituito. Se diversi elementi sono equivalenti a l'elemento più grande, l'iteratore per l'ultimo elemento del genere viene restituito.

Original:

a pair consisting of an iterator to the smallest element as the first element and an iterator to the greatest element as the second. Returns std::make_pair(first, first) if the range is empty. If several elements are equivalent to the smallest element, the iterator to the first such element is returned. If several elements are equivalent to the largest element, the iterator to the last such element is returned.

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Complessità

Alla maggior parte delle applicazioni max(floor(3/2(N−1)), 0) del predicato, in cui N =std::distance(first, last).

Original:

At most max(floor(3/2(N−1)), 0) applications of the predicate, where N =std::distance(first, last).

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Possibile implementazione

First version
template<class ForwardIt>std::pair<ForwardIt, ForwardIt> minmax_element(ForwardIt first, ForwardIt last){typedeftypenamestd::iterator_traits<ForwardIt>::value_type value_t;return std::minmax_element(first, last, std::less<value_t>());}
Second version
template<class ForwardIt, class Compare>std::pair<ForwardIt, ForwardIt> minmax_element(ForwardIt first, ForwardIt last, Compare comp){std::pair<ForwardIt, ForwardIt> result(first, first);   if(first == last)return result;if(++first == last)return result;   if(comp(*first, *result.first)){ result.second= result.first; result.first= first;}else{ result.second= first;}while(++first != last){ ForwardIt i = first;if(++first == last){if(comp(*i, *result.first)) result.first= i;elseif(!(comp(*i, *result.second))) result.second= i;break;}else{if(comp(*first, *i)){if(comp(*first, *result.first)) result.first= first;if(!(comp(*i, *result.second))) result.second= i;}else{if(comp(*i, *result.first)) result.first= i;if(!(comp(*first, *result.second))) result.second= first;}}}return result;}

Esempio

#include <algorithm>#include <iostream>#include <vector>   int main(){std::vector<int> v ={3, 9, 1, 4, 2, 5, 9};   auto result = std::minmax_element(v.begin(), v.end());std::cout<<"min element at: "<<(result.first- v.begin())<<'\n';std::cout<<"max element at: "<<(result.second- v.begin())<<'\n';}

Output:

min element at: 2 max element at: 6

Vedi anche

min_element	restituisce l'elemento più piccolo in un intervallo Original: returns the smallest element in a range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
max_element	restituisce l'elemento più grande in un intervallo Original: returns the largest element in a range The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)