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std::next_permutation

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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 BidirIt >
bool next_permutation( BidirIt first, BidirIt last );
(1)
template< class BidirIt, class Compare >
bool next_permutation( BidirIt first, BidirIt last, Compare comp );
(2)
Transforma o [first, last) intervalo na permutação seguinte a partir do conjunto de todas as permutações que são lexicographically ordenadas em relação a operator< ou comp. Retorna true se existe tal permutação, caso contrário, transforma a faixa para a primeira permutação (como se por std::sort(first, last)) e retorna false.
Original:
Transforms the range [first, last) into the next permutation from the set of all permutations that are lexicographically ordered with respect to operator< or comp. Returns true if such permutation exists, otherwise transforms the range into the first permutation (as if by std::sort(first, last)) and returns false.
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Índice

[editar] Parâmetros

first, last -
a gama de elementos para permutar
Original:
the range of elements to permute
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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 an object of type BidirIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
BidirIt must meet the requirements of ValueSwappable and BidirectionalIterator.

[editar] Valor de retorno

true se a permutação novo é lexicograficamente maior do que o antigo. false se a permutação última foi alcançado ea gama foi redefinido para a permutação primeiro.
Original:
true if the new permutation is lexicographically greater than the old. false if the last permutation was reached and the range was reset to the first permutation.
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[editar] Complexidade

Na maioria dos swaps N/2, onde N = std::distance(first, last).
Original:
At most N/2 swaps, where N = std::distance(first, last).
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[editar] Possível implementação

template<class BidirIt>
bool next_permutation(BidirIt first, BidirIt last)
{
    if (first == last) return false;
    BidirIt i = last;
    if (first == --i) return false;
 
    while (1) {
        BidirIt i1, i2;
 
        i1 = i;
        if (*--i < *i1) {
            i2 = last;
            while (!(*i < *--i2))
                ;
            std::iter_swap(i, i2);
            std::reverse(i1, last);
            return true;
        }
        if (i == first) {
            std::reverse(first, last);
            return false;
        }
    }
}

[editar] Exemplo

O código a seguir imprime todas as três permutações da seqüência "aba"
Original:
The following code prints all three permutations of the string "aba"
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#include <algorithm>
#include <string>
#include <iostream>
 
int main()
{
    std::string s = "aba";
    std::sort(s.begin(), s.end());
    do {
        std::cout << s << '\n';
    } while(std::next_permutation(s.begin(), s.end()));
}

Output:

aab
aba
baa

[editar] Veja também

determines if a sequence is a permutation of another sequence
(modelo de função) [edit]
generates the next smaller lexicographic permutation of a range of elements
(modelo de função) [edit]