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std::find_end

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< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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C library
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Defined in header <algorithm>
template< class ForwardIt1, class ForwardIt2 >

ForwardIt1 find_end( ForwardIt1 first, ForwardIt1 last,

                     ForwardIt2 s_first, ForwardIt2 s_last );
(1)
template< class ForwardIt1, class ForwardIt2, class BinaryPredicate >

ForwardIt1 find_end( ForwardIt1 first, ForwardIt1 last,

                     ForwardIt2 s_first, ForwardIt2 s_last, BinaryPredicate p );
(2)
Procura a subseqüência última [s_first, s_last) elementos no [first, last) intervalo. A primeira versão utiliza operator== para comparar os elementos, a segunda versão usa o predicado binário dado p.
Original:
Searches for the last subsequence of elements [s_first, s_last) in the range [first, last). The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Índice

[editar] Parâmetros

first, last -
a gama de elementos para examinar
Original:
the range of elements to examine
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s_first, s_last -
a gama de elementos para pesquisar
Original:
the range of elements to search for
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p - binary predicate which returns ​true if the elements should be treated as equal.

The signature of the predicate function should be equivalent to the following:

 bool pred(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 ForwardIt1 and ForwardIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively.

Type requirements
-
ForwardIt1 must meet the requirements of ForwardIterator.
-
ForwardIt2 must meet the requirements of ForwardIterator.

[editar] Valor de retorno

Iterator para o início da subsequência [s_first, s_last) último intervalo [first, last).
Original:
Iterator to the beginning of last subsequence [s_first, s_last) in range [first, last).
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Se nenhuma subsequência tal for encontrado, last é retornada. (até C + 11)
Original:
If no such subsequence is found, last is returned. (até C + 11)
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Se [s_first, s_last) está vazio ou se não subseqüência tal for encontrado, last é devolvido. (a partir do C++ 11)
Original:
If [s_first, s_last) is empty or if no such subsequence is found, last is returned. (a partir do C++ 11)
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[editar] Complexidade

Será que a maioria das comparações dos S*(N-S+1) onde S = distance(s_first, s_last) e N = distance(first, last).
Original:
Does at most S*(N-S+1) comparisons where S = distance(s_first, s_last) and N = distance(first, last).
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[editar] Possível implementação

First version
template<class ForwardIt1, class ForwardIt2>
ForwardIt1 find_end(ForwardIt1 first, ForwardIt1 last,
                    ForwardIt2 s_first, ForwardIt2 s_last)
{
    if (s_first == s_last)
        return last;
    ForwardIt1 result = last;
    while (1) {
        ForwardIt1 new_result = std::search(first, last, s_first, s_last);
        if (new_result == last) {
            return result;
        } else {
            result = new_result;
            first = result;
            ++first;
        }
    }
    return result;
}
Second version
template<class ForwardIt1, class ForwardIt2, class BinaryPredicate>
ForwardIt1 find_end(ForwardIt1 first, ForwardIt1 last,
                    ForwardIt2 s_first, ForwardIt2 s_last,
                    BinaryPredicate p)
{
    if (s_first == s_last)
        return last;
    ForwardIt1 result = last;
    while (1) {
        ForwardIt1 new_result = std::search(first, last, s_first, s_last, p);
        if (new_result == last) {
            return result;
        } else {
            result = new_result;
            first = result;
            ++first;
        }
    }
    return result;
}

[editar] Exemplo

O código a seguir usa find_end() para procurar por duas diferentes seqüências de números .
Original:
The following code uses find_end() to search for two different sequences of numbers.
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#include <algorithm>
#include <iostream>
#include <vector>
 
int main()
{
    std::vector<int> v{1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4};
    std::vector<int>::iterator result;
 
    std::vector<int> t1{1, 2, 3};
 
    result = std::find_end(v.begin(), v.end(), t1.begin(), t1.end());
    if (result == v.end()) {
        std::cout << "subsequence not found\n";
    } else {
        std::cout << "last subsequence is at: "
                  << std::distance(v.begin(), result) << "\n";
    }
 
    std::vector<int> t2{4, 5, 6};
    result = std::find_end(v.begin(), v.end(), t2.begin(), t2.end());
    if (result == v.end()) {
        std::cout << "subsequence not found\n";
    } else {
        std::cout << "last subsequence is at: " 
                  << std::distance(v.begin(), result) << "\n";
    }
}

Output:

last subsequence is at: 8
subsequence not found

[editar] Veja também

encontra dois idênticos (ou algum outro relacionamento) itens adjacentes uns aos outros
Original:
finds two identical (or some other relationship) items adjacent to each other
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(modelo de função) [edit]
encontra o primeiro elemento satisfazer critérios específicos
Original:
finds the first element satisfying specific criteria
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(modelo de função) [edit]
searches for any one of a set of elements
(modelo de função) [edit]
Procura por um número de cópias consecutivos de um elemento em uma faixa
Original:
searches for a number consecutive copies of an element in a range
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(modelo de função) [edit]