C++ unordered_multimap bucket_size()用法及代码示例

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。

用法:

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：它返回一个无符号整数类型，该整数类型表示存储桶中编号为n的存储单元的数量。

以下示例程序旨在说明上述函数：

示例1:

// C++ program to illustrate the 
// unordered_multimap::bucket_size() 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // declaration 
    unordered_multimap<int, int> 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

示例2:

// C++ program to illustrate the 
// unordered_multimap::bucket_size()  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // declaration 
    unordered_multimap<char, char> 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

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 unordered_multimap bucket_size() function in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。