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This article mainly introduces "how to use C++ 's STL algorithm". In daily operation, I believe many people have doubts about how to use C++ 's STL algorithm. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "how to use C++ 's STL algorithm". Next, please follow the editor to study!

STL algorithm is a general function of operations such as search, search, delete and so on, and its application range is very wide. To use the STL algorithm, the application must include a header file:

# include uses STL algorithm

1.count () and count_if ()

The algorithms std:::count () and count_if () calculate the number of elements in a given range.

The following demonstrates using the STL algorithms std::count () and count_if () to calculate how many elements contain the specified value and meet the specified condition, respectively:

# include#include#includeusing namespace std;templatebool IsEven (const elementType& number) / / unary predicate {return {(number%2) = = 0};} int main () {vectorvecIntegers;for (int nNum=1;nNum)

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