std::set_difference

 

C++

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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
Heap operazioni Original: Heap operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 InputIt1, class InputIt2, class OutputIt > OutputIt set_difference( InputIt1 first1, InputIt1 last1,                          InputIt2 first2, InputIt2 last2,                          OutputIt d_first );	(1)
template<class InputIt1, class InputIt2,           class OutputIt, class Compare > OutputIt set_difference( InputIt1 first1, InputIt1 last1,                          InputIt2 first2, InputIt2 last2,                          OutputIt d_first, Compare comp );	(2)

Copia gli elementi della gamma [first1, last1) ordinato che non si trovano nel campo di [first2, last2) ordinato all'inizio gamma a d_first.

Original:

Copies the elements from the sorted range [first1, last1) which are not found in the sorted range [first2, last2) to the range beginning at d_first.

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Il campo risultante è anche ordinato. La prima versione si aspetta che sia l'ingresso che varia da ordinare con operator<, la seconda versione si aspetta che essere ordinati con il confronto comp data funzione. Elementi equivalenti sono trattati singolarmente, cioè se qualche elemento è trovato m volte in [first1, last1) e n volte in [first2, last2), verrà copiato d_first esattamente std::max(m-n, 0) volte. L'intervallo risultante non possono sovrapporsi uno dei campi di ingresso.

Original:

The resulting range is also sorted. The first version expects both input ranges to be sorted with operator<, the second version expects them to be sorted with the given comparison function comp. Equivalent elements are treated individually, that is, if some element is found m times in [first1, last1) and n times in [first2, last2), it will be copied to d_first exactly std::max(m-n, 0) times. The resulting range cannot overlap with either of the input ranges.

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Parametri

first1, last1	-	la gamma di elementi da esaminare Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
first2, last2	-	la gamma di elementi da cercare Original: the range of elements to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
comp	-	comparison function which returns ​true if the first argument is less than the second. 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 objects of types InputIt1 and InputIt2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively. ​
Type requirements
- InputIt1 must meet the requirements of InputIterator.
- InputIt2 must meet the requirements of InputIterator.
- OutputIt must meet the requirements of OutputIterator.

Valore di ritorno

Iterator oltre la fine della gamma costruito.

Original:

Iterator past the end of the constructed range.

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Complessità

A confronto la maggior parte 2·(N₁+N₂-1), dove N₁=std::distance(first1, last1) e N₂=std::distance(first2, last2).

Original:

At most 2·(N₁+N₂-1) comparisons, where N₁=std::distance(first1, last1) and N₂=std::distance(first2, last2).

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Possibile implementazione

First version
template<class InputIt1, class InputIt2, class OutputIt> OutputIt set_difference(InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, OutputIt d_first){while(first1 != last1){if(first2 == last2)returnstd::copy(first1, last1, d_first);   if(*first1 <*first2){*d_first++=*first1++;}else{if(!(*first2 <*first1)){++first1;}++first2;}}return d_first;}
Second version
template<class InputIt1, class InputIt2, class OutputIt, class Compare> OutputIt set_difference( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, OutputIt d_first, Compare comp){while(first1 != last1){if(first2 == last2)returnstd::copy(first1, last1, d_first);   if(comp(*first1, *first2)){*d_first++=*first1++;}else{if(!comp(*first2, *first1)){++first1;}++first2;}}return d_first;}

Esempio

#include <iostream>#include <algorithm>#include <vector>#include <iterator>   int main(){std::vector<int> v1 {1, 2, 5, 5, 5, 9};std::vector<int> v2 {2, 5, 7};std::vector<int> diff;   std::set_difference(v1.begin(), v1.end(), v2.begin(), v2.end(), std::inserter(diff, diff.begin()));   for(auto i : v1)std::cout<< i <<' ';std::cout<<"minus ";for(auto i : v2)std::cout<< i <<' ';std::cout<<"is: ";   for(auto i : diff)std::cout<< i <<' ';std::cout<<'\n';}

Output:

1 2 5 5 5 9 minus 2 5 7 is: 1 5 5 9

Vedi anche

includes	restituisce true se un insieme è un sottoinsieme di un altro Original: returns true if one set is a subset of another 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)
set_symmetric_difference	calcola la differenza simmetrica tra due insiemi Original: computes the symmetric difference between two sets 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)