C++ STL中的unordered_multimap bucket_size()函数

unordered_multimap :: bucket_size()是C++ STL中的内置函数，该函数返回存储区n中的元素数。

句法：

unordered_multimap_name.bucket_size(n)

参数：该函数接受参数n ，该参数指定要返回其计数的存储区编号。

返回值：返回一个无符号整数类型，该整数类型表示存储桶中n为存储桶的元素数。

下面的程序说明了上述函数：

程序1：

// C++ program to illustrate the
// unordered_multimap::bucket_size()
#include 
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multimap sample;
  
    // inserts element
    sample.insert({ 10, 100 });
    sample.insert({ 10, 100 });
    sample.insert({ 20, 200 });
    sample.insert({ 30, 300 });
    sample.insert({ 15, 150 });
  
    cout << "The total count of buckets: " 
         << sample.bucket_count();
  
    // prints all element bucket wise
    for (int i = 0; i < sample.bucket_count(); i++) {
  
        cout << "\nNumber of elements in Bucket " << i
             << " = " << sample.bucket_size(i);
    }
    return 0;
}

输出：

The total count of buckets: 7
Number of elements in Bucket 0 = 0
Number of elements in Bucket 1 = 1
Number of elements in Bucket 2 = 1
Number of elements in Bucket 3 = 2
Number of elements in Bucket 4 = 0
Number of elements in Bucket 5 = 0
Number of elements in Bucket 6 = 1

程式2：

// C++ program to illustrate the
// unordered_multimap::bucket_size() 
#include 
using namespace std;
  
int main()
{
  
    // declaration
    unordered_multimap sample;
  
    // inserts element
    sample.insert({ 'a', 'b' });
    sample.insert({ 'a', 'b' });
    sample.insert({ 'b', 'c' });
    sample.insert({ 'r', 'a' });
    sample.insert({ 'c', 'b' });
  
    cout << "The total count of buckets: " 
         << sample.bucket_count();
  
    // prints all element bucket wise
    for (int i = 0; i < sample.bucket_count(); i++) {
  
        cout << "\nNumber of elements in Bucket " << i
             << " = " << sample.bucket_size(i);
    }
    return 0;
}

输出：

The total count of buckets: 7
Number of elements in Bucket 0 = 1
Number of elements in Bucket 1 = 1
Number of elements in Bucket 2 = 1
Number of elements in Bucket 3 = 0
Number of elements in Bucket 4 = 0
Number of elements in Bucket 5 = 0
Number of elements in Bucket 6 = 2

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