Timer is Running

C++ STL | Set 8 (unordered set)
Submissions: 1390   Accuracy:


  Difficulty: Basic   Marks: 1

Implement different operations on an unordered set s .

The first line of input contains an integer T denoting the no of test cases . Then T test cases follow. The first line of input contains an integer Q denoting the no of queries . Then in the next line are Q space separated queries .
A query can be of four types 
1. a x (inserts an element x to the unordered set s)
2. b x (erases an element x from the unordered set s)
3. c x (prints 1 if the element x is present in the set else print -1)
4. d    (prints the size of the unordered set s)

The output for each test case will  be space separated integers denoting the results of each query . 


Example(To be used only for only expected output):

a 1 a 2 a 3 b 2 d
a 1 a 5 d c 2

2 -1

Explanation :
For the first test case

There are five queries. Queries are performed in this order
1. a 1     {inserts 1 to set now set has {1} }
2. a 2     {inserts 2 to set now set has {1,2} }
3. a 3     {inserts 3 to set now set has {1,2,3} }
4. b 2     {removes 2 from the set }
5. d        {prints the size of the unordered set ie 2}

For the second test case 
There are four queries. Queries are performed in this order
1. a 1    {inserts 1 to set now set has {1} }
2. a 5    {inserts 5 to set now set has {1,5} }
3. d       {prints the size of the set ie 2}
4. c 2    {since 2 is not present in the set prints -1}

Note:The Input/Output format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **

Author: Shubham Joshi 1

If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.

Need help with your code? Please use ide.geeksforgeeks.org, generate link and share the link here.

to report an issue on this page.