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std::find_end

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< cpp‎ | algorithm

 
 
Algoritmo biblioteca
Funciones
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Functions
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Para no modificar la secuencia de las operaciones
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Non-modifying sequence operations
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Modificación de la secuencia de operaciones
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Modifying sequence operations
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Particionamiento operaciones
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Partitioning operations
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Clasificación de las operaciones (en rangos ordenados)
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Sorting operations (on sorted ranges)
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Las operaciones binarias de búsqueda (en rangos ordenados)
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Binary search operations (on sorted ranges)
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Conjunto de operaciones (en rangos ordenados)
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Set operations (on sorted ranges)
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Operaciones del montón
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Heap operations
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Mínimo / máximo de operaciones
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Minimum/maximum operations
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Operaciones 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)
Busca el último subsecuencia de [s_first, s_last) elementos en la [first, last) rango. La primera versión utiliza operator== para comparar los elementos, la segunda versión utiliza el predicado binario 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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Contenido

[editar] Parámetros

first, last -
la gama de elementos a examinar
Original:
the range of elements to examine
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s_first, s_last -
la gama de elementos a buscar
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 el comienzo de [s_first, s_last) subsecuencia última en el rango [first, last) .
Original:
Iterator to the beginning of last subsequence [s_first, s_last) in range [first, last).
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Si no se encuentra dicha subsecuencia, last se devuelve. (hasta C++11)
Original:
If no such subsequence is found, last is returned. (hasta C++11)
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Si [s_first, s_last) está vacío o si no se encuentra dicha subsecuencia, last se devuelve. (desde C++11)
Original:
If [s_first, s_last) is empty or if no such subsequence is found, last is returned. (desde C++11)
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[editar] Complejidad

¿Tiene en la mayoría de las comparaciones S*(N-S+1) donde S = distance(s_first, s_last) y 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] Posible implementación

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] Ejemplo

El código siguiente utiliza find_end() para buscar dos diferentes secuencias 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] Ver también

encuentra dos idénticas (o alguna otra relación) elementos adyacentes el uno al otro
Original:
finds two identical (or some other relationship) items adjacent to each other
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(función de plantilla) [edit]
encuentra el primer elemento que satisfaga los criterios específicos
Original:
finds the first element satisfying specific criteria
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(función de plantilla) [edit]
searches for any one of a set of elements
(función de plantilla) [edit]
Busca un número de copias consecutivas de un elemento en un rango
Original:
searches for a number consecutive copies of an element in a range
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(función de plantilla) [edit]