std::set_difference
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Definido no cabeçalho <algorithm> | ||
template<class InputIt1, class InputIt2, class OutputIt > OutputIt set_difference( InputIt1 first1, InputIt1 last1, | (1) | |
template<class InputIt1, class InputIt2, class OutputIt, class Compare > | (2) | |
Copia os elementos da gama
[first1, last1) ordenada, que não se encontram na gama [first2, last2) ordenadas para o início de intervalo 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. The text has been machine-translated via Google Translate.
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O intervalo resultante é também classificada. A primeira versão espera que tanto a entrada varia de ser resolvido com operator<, a segunda versão espera que sejam classificados com o
comp dada função de comparação. Elementos equivalentes são tratados individualmente, isto é, se algum elemento é encontrado m vezes em [first1, last1) e n vezes em [first2, last2), ele será copiado para d_first exactamente std::max(m-n, 0) vezes. O intervalo resultante não pode sobrepor-se a qualquer das faixas de entrada.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.The text has been machine-translated via Google Translate.
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Índice |
[editar]Parâmetros
| first1, last1 | - | a gama de elementos para examinar 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 | - | a gama de elementos para pesquisar 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. |
| Type requirements | ||
-InputIt1 must meet the requirements of InputIterator. | ||
-InputIt2 must meet the requirements of InputIterator. | ||
-OutputIt must meet the requirements of OutputIterator. | ||
[editar]Valor de retorno
Iterator após o final do intervalo construída.
Original:
Iterator past the end of the constructed range.
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[editar]Complexidade
Na maioria das comparações dos 2·(N1+N2-1), onde 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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[editar]Possível implementação
| 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;} |
[editar]Exemplo
#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';}
Saída:
1 2 5 5 5 9 minus 2 5 7 is: 1 5 5 9
[editar]Veja também
devolve verdadeiro se um conjunto é um subconjunto de uma outra 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. (modelo de função) | |
calcula a diferença entre os dois conjuntos simétricos 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. (modelo de função) | |
