iterator unordered_map_name.end(n)

// CPP program to demonstrate the
// unordered_map::end() function
// returning all the elements of the multimap
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;
  
int main()
{
    unordered_map<string, int> marks;
  
    // Declaring the elements of the multimap
    marks = { { "Rohit", 64 }, { "Aman", 37 }, { "Ayush", 96 } };
  
    // Printing all the elements of the multimap
    cout << "marks bucket contains : " << endl;
    for (int i = 0; i < marks.bucket_count(); ++i) {
  
        cout << "bucket #" << i << " contains:";
  
        for (auto iter = marks.begin(i); iter != marks.end(i); ++iter) {
            cout << "(" << iter->first << ", " << iter->second << "), ";
        }
  
        cout << endl;
    }
    return 0;
}

marks bucket contains : 
bucket #0 contains:
bucket #1 contains:
bucket #2 contains:
bucket #3 contains:(Aman, 37), (Rohit, 64), 
bucket #4 contains:(Ayush, 96),

// CPP program to demonstrate the
// unordered_map::end() function
// returning the elements along
// with their bucket number
#include <iostream>
#include <string>
#include <unordered_map>
  
using namespace std;
  
int main()
{
    unordered_map<string, int> marks;
  
    // Declaring the elements of the multimap
    marks = { { "Rohit", 64 }, { "Aman", 37 }, { "Ayush", 96 } };
  
    // Printing all the elements of the multimap
    for (auto iter = marks.begin(); iter != marks.end(); ++iter) {
  
        cout << "Marks of " << iter->first << " is "
             << iter->second << " and his bucket number is "
             << marks.bucket(iter->first) << endl;
    }
  
    return 0;
}

Marks of Ayush是96，他的桶编号是4
Marks of Aman是37，他的桶编号是3
Marks of Rohit是64，他的桶编号是3