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std::lexicographical_compare

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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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lexicographical_compare
is_permutation(C++11)
next_permutation
prev_permutation
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 InputIt1, class InputIt2 >

bool lexicographical_compare( InputIt1 first1, InputIt1 last1,

                              InputIt2 first2, InputIt2 last2 );
(1)
template< class InputIt1, class InputIt2, class Compare >

bool lexicographical_compare( InputIt1 first1, InputIt1 last1,
                              InputIt2 first2, InputIt2 last2,

                              Compare comp );
(2)
Comprueba si el primer intervalo es [first1, last1) lexicográfico' menor que el [first2, last2) segundo rango. La primera versión utiliza operator< para comparar los elementos, la segunda versión utiliza la función de comparación dado comp .
Original:
Checks if the first range [first1, last1) is lexicographically less than the second range [first2, last2). The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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Comparación lexicográfica es una operación con las siguientes propiedades:
Original:
Lexicographical comparison is a operation with the following properties:
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  • Dos cadenas se comparan elemento por elemento .
    Original:
    Two ranges are compared element by element.
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  • El elemento descalce primera define qué rango es menos lexicográfico''' o mayor que el otro .
    Original:
    The first mismatching element defines which range is lexicographically less or greater than the other.
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  • Si una serie es un prefijo de otro, el rango más corto es lexicográfico' menos que el otro .
    Original:
    If one range is a prefix of another, the shorter range is lexicographically less than the other.
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  • Si dos gamas tienen elementos equivalentes y son de la misma longitud, entonces los rangos son iguales lexicográficamente' .
    Original:
    If two ranges have equivalent elements and are of the same length, then the ranges are lexicographically equal.
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  • Un rango de vacío es lexicográfico' menos de cualquier rango que no esté vacía .
    Original:
    An empty range is lexicographically less than any non-empty range.
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  • Dos cadenas vacías son lexicográfico' igual .
    Original:
    Two empty ranges are lexicographically equal.
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Contenido

[editar] Parámetros

first1, last1 -
la primera gama de elementos a examinar
Original:
the first range of elements to examine
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first2, last2 -
la segunda gama de elementos a examinar
Original:
the second range of elements to examine
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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, InputIt2 must meet the requirements of InputIterator.

[editar] Valor de retorno

true si el primer intervalo es lexicográficamente' menos que el segundo .
Original:
true if the first range is lexicographically less than the second.
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[editar] Complejidad

En la mayoría de aplicaciones 2·min(N1, N2) de la operación de comparación, donde N1 = std::distance(first1, last1) y N2 = std::distance(first2, last2) .
Original:
At most 2·min(N1, N2) applications of the comparison operation, where N1 = std::distance(first1, last1) and N2 = std::distance(first2, last2).
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[editar] Posible implementación

First version
template<class InputIt1, class InputIt2>
bool lexicographical_compare(InputIt1 first1, InputIt1 last1,
                             InputIt2 first2, InputIt2 last2)
{
    for ( ; (first1 != last1) && (first2 != last2); first1++, first2++ ) {
        if (*first1 < *first2) return true;
        if (*first2 < *first1) return false;
    }
    return (first1 == last1) && (first2 != last2);
}
Second version
template<class InputIt1, class InputIt2, class Compare>
bool lexicographical_compare(InputIt1 first1, InputIt1 last1,
                             InputIt2 first2, InputIt2 last2,
                             Compare comp)
{
    for ( ; (first1 != last1) && (first2 != last2); first1++, first2++ ) {
        if (comp(*first1, *first2)) return true;
        if (comp(*first2, *first1)) return false;
    }
    return (first1 == last1) && (first2 != last2);
}

[editar] Ejemplo

#include <algorithm>
#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
 
int main()
{
    std::vector<char> v1 {'a', 'b', 'c', 'd'};
    std::vector<char> v2 {'a', 'b', 'c', 'd'};
 
    std::srand(std::time(0));
    while (!std::lexicographical_compare(v1.begin(), v1.end(),
                                         v2.begin(), v2.end())) {
        for (auto c : v1) std::cout << c << ' ';
        std::cout << ">= ";
        for (auto c : v2) std::cout << c << ' ';
        std::cout << '\n';
 
        std::random_shuffle(v1.begin(), v1.end());
        std::random_shuffle(v2.begin(), v2.end());
    }
 
    for (auto c : v1) std::cout << c << ' ';
    std::cout << "< ";
    for (auto c : v2) std::cout << c << ' ';
    std::cout << '\n';
}

Possible output:

a b c d >= a b c d 
d a b c >= c b d a 
b d a c >= a d c b 
a c d b < c d a b