Multiset - Allow Duplicate Elements

Multiset - Allow Duplicate Elements

Hard C++ STL 38 views
Explanation Complexity

Problem Statement

Like set but allows duplicates, keeps sorted.
Real Life: Sorted list with repetitions allowed.

Input Format

No user input.
Elements are inserted into a container.

Output Format

Elements printed in sorted order, including duplicates.

Example

Insert: 5
Insert: 3
Insert: 5
Insert: 2

2 3 5 5

Constraints

• Elements can repeat

• Order is always sorted automatically

Concept Explanation

A multiset is similar to a set, but it allows duplicate values.
All elements are stored in sorted order automatically.
This is useful when repetitions matter.

Step-by-Step Explanation

1.Create a multiset.

2.Insert elements using insert().

3.Duplicates are allowed, so same value can be inserted multiple times.

4.Multiset automatically keeps elements sorted.

5.Traverse the multiset using an iterator.

6.Print all elements in order.

Concept Explanation

A multiset is similar to a set, but it allows duplicate values.
All elements are stored in sorted order automatically.
This is useful when repetitions matter.

Step-by-Step Explanation

1.Create a multiset.

2.Insert elements using insert().

3.Duplicates are allowed, so same value can be inserted multiple times.

4.Multiset automatically keeps elements sorted.

5.Traverse the multiset using an iterator.

6.Print all elements in order.

Input / Output Format

Input Format
No user input.
Elements are inserted into a container.
Output Format
Elements printed in sorted order, including duplicates.
Constraints
• Elements can repeat

• Order is always sorted automatically

Examples

Input:
Insert: 5 Insert: 3 Insert: 5 Insert: 2
Output:
2 3 5 5

Example Solution (Public)

C++ 
void stl_q12_multiset() {
    multiset<int> ms;
    
    ms.insert(10);
    ms.insert(20);
    ms.insert(10);
    ms.insert(30);
    ms.insert(20);
    
    cout << "Multiset (sorted with duplicates): ";
    for(int num : ms) {
        cout << num << " ";
    }
    cout << endl;
    
    cout << "Count of 10: " << ms.count(10) << endl;
}

Official Solution Code

void stl_q12_multiset() {
    multiset<int> ms;
    
    ms.insert(10);
    ms.insert(20);
    ms.insert(10);
    ms.insert(30);
    ms.insert(20);
    
    cout << "Multiset (sorted with duplicates): ";
    for(int num : ms) {
        cout << num << " ";
    }
    cout << endl;
    
    cout << "Count of 10: " << ms.count(10) << endl;
}
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Output

                                        

                                    

                                    

                                        

                                                                                    
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