📜  C++ STL中的unordered_set bucket_size()

📅  最后修改于: 2021-05-30 16:00:07             🧑  作者: Mango

unordered_set :: bucket_size()函数是C++ STL中的内置函数,它返回unordered_set容器中特定存储桶中存在的元素总数。
铲斗处于unordered_set的内部散列表的狭槽,其中元素被存储。
注意:unordered_set中的存储桶编号从0到n-1,其中n是存储桶的总数。
语法

unordered_set.bucket_size(n);

参数:该函数接受一个必填的单个参数n 。此参数表示要查找元素总数所需的存储桶编号。
返回值:该函数返回存储区n中存在的元素总数。
下面的程序说明了unordered_set :: bucket_size()函数:
程序1

CPP
// CPP program to illustrate the
// unordered_set::bucket_size() function
#include 
#include 
using namespace std;
 
int main()
{
 
    unordered_set sampleSet;
 
    // to store number of buckets
    int bucketCount;
 
    // Inserting elements
    sampleSet.insert(5);
    sampleSet.insert(10);
    sampleSet.insert(15);
    sampleSet.insert(20);
    sampleSet.insert(25);
 
    bucketCount = sampleSet.bucket_count();
    // displaying number of buckets
    cout << "sampleSet has " << bucketCount << " buckets\n";
 
    // displaying number of elements in bucket numbered 1
    cout << "Bucket number 3 contains "
         << sampleSet.bucket_size(3) << " elements";
 
    return 0;
}


CPP
// CPP program to illustrate the
// unordered_set::bucket_size() function
 
#include 
#include 
 
using namespace std;
 
int main()
{
 
    unordered_set sampleSet;
 
    // to store number of buckets
    int bucketCount;
 
    // Inserting elements
    sampleSet.insert("Welcome");
    sampleSet.insert("To");
    sampleSet.insert("GeeksforGeeks");
    sampleSet.insert("Computer Science Portal");
    sampleSet.insert("For Geeks");
 
    bucketCount = sampleSet.bucket_count();
    // displaying number of buckets
    cout << "sampleSet has " << bucketCount << " buckets\n";
 
    // displaying number of elements in bucket numbered 0
    cout << "Bucket number 0 contains "
         << sampleSet.bucket_size(0) << " elements";
 
    return 0;
}


输出

sampleSet has 7 buckets
Bucket number 3 contains 1 elements

程序2

CPP

// CPP program to illustrate the
// unordered_set::bucket_size() function
 
#include 
#include 
 
using namespace std;
 
int main()
{
 
    unordered_set sampleSet;
 
    // to store number of buckets
    int bucketCount;
 
    // Inserting elements
    sampleSet.insert("Welcome");
    sampleSet.insert("To");
    sampleSet.insert("GeeksforGeeks");
    sampleSet.insert("Computer Science Portal");
    sampleSet.insert("For Geeks");
 
    bucketCount = sampleSet.bucket_count();
    // displaying number of buckets
    cout << "sampleSet has " << bucketCount << " buckets\n";
 
    // displaying number of elements in bucket numbered 0
    cout << "Bucket number 0 contains "
         << sampleSet.bucket_size(0) << " elements";
 
    return 0;
}

输出

sampleSet has 7 buckets
Bucket number 0 contains 0 elements 
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