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std::min_element

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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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max
max_element
min
min_element
minmax(C++11)
minmax_element(C++11)
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 ForwardIt >
ForwardIt min_element( ForwardIt first, ForwardIt last );
(1)
template< class ForwardIt, class Compare >
ForwardIt min_element( ForwardIt first, ForwardIt last, Compare comp );
(2)
Encontra o menor elemento no [first, last) alcance. A primeira versão utiliza operator< para comparar os valores, a segunda versão utiliza a função de comparação dada comp.
Original:
Finds the smallest element in the range [first, last). The first version uses operator< to compare the values, the second version uses the given comparison function comp.
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Índice

[editar] Parâmetros

first, last -
iteradores para a frente que definem o intervalo para examinar
Original:
forward iterators defining the range to examine
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cmp - comparison function which returns ​true if if *a is less than *b.

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 ForwardIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[editar] Valor de retorno

Iterador para o elemento mais pequeno da gama [first, last). Se vários elementos da gama são equivalentes ao elemento mais pequeno, retorna o iterador para o primeiro elemento desse tipo. Retorna last se o intervalo é vazio.
Original:
Iterator to the smallest element in the range [first, last). If several elements in the range are equivalent to the smallest element, returns the iterator to the first such element. Returns last if the range is empty.
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[editar] Complexidade

Exactamente max(N-1,0) comparações, onde N = std::distance(first, last).
Original:
Exactly max(N-1,0) comparisons, where N = std::distance(first, last).
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[editar] Possível implementação

First version
template<class ForwardIt>
ForwardIt min_element(ForwardIt first, ForwardIt last)
{
    if (first == last) return last;
 
    ForwardIt smallest = first;
    ++first;
    for (; first != last; ++first) {
        if (*first < *smallest) {
            smallest = first;
        }
    }
    return smallest;
}
Second version
template<class ForwardIt, class Compare>
ForwardIt min_element(ForwardIt first, ForwardIt last, 
                            Compare comp)
{
    if (first == last) return last;
 
    ForwardIt smallest = first;
    ++first;
    for (; first != last; ++first) {
        if (comp(*first, *smallest)) {
            smallest = first;
        }
    }
    return smallest;
}

[editar] Exemplo

#include <algorithm>
#include <iostream>
#include <vector>
 
int main()
{
    std::vector<int> v{3, 1, 4, 1, 5, 9};
 
    std::vector<int>::iterator result = std::min_element(v.begin(), v.end());
    std::cout << "min element at: " << std::distance(v.begin(), result);
}

Output:

min element at: 1

[editar] Veja também

retorna o maior elemento de um intervalo
Original:
returns the largest element in a range
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(modelo de função) [edit]
retorna o elemento menor e maior em um intervalo
Original:
returns the smallest and the largest element in a range
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(modelo de função) [edit]
retorna o menor dos dois elementos
Original:
returns the smaller of two elements
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(modelo de função) [edit]