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unordered_set bucket() function in C++ STL
  • Difficulty Level : Basic
  • Last Updated : 28 Sep, 2018

The unordered_set::bucket() method is a builtin function in C++ STL which returns the bucket number of a specific element. That is, this function returns the bucket number where a specific element is stored in the unordered_set container.

The bucket is a slot in the unordered_set’s internal hash table where elements are stored.

Note: Buckets in unordered_set are numbered from 0 to n-1, where n is the total number of buckets.



Parameter: This is a mandatory parameter and specifies the value of the element whose bucket number is needed to know in the unordered_set container.

Return Value: This function returns the bucket number of the bucket in the unordered_set container where the element with value element is stored.

Below programs illustrate the unordered_set::bucket() function:

// C++ program to illustrate the
// unordered_set::bucket() function
#include <iostream>
#include <unordered_set>
using namespace std;
int main()
    unordered_set<int> sampleSet;
    // Inserting elements
    for (auto itr = sampleSet.begin(); itr != sampleSet.end(); itr++) {
        cout << "The Element " << (*itr) << " is present in the bucket: "
             << sampleSet.bucket(*itr);
        cout << endl;
    return 0;
The Element 25 is present in the bucket: 3
The Element 5 is present in the bucket: 5
The Element 10 is present in the bucket: 10
The Element 15 is present in the bucket: 4
The Element 20 is present in the bucket: 9
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