Hacker Rank solution for Sets-STL In C++

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Check This- Hacker rank Solution for C++ Sub Domain Introduction, Classes, STL, Inheritance.

Explanation:- In C++ Sets ( are containers that store unique elements ) is an Important part of the STL ( Standard Template Library). Mostly used member functions of sets are:

Declaration:

set<int>st; //Creates a set of integers.

//st is a name of set

Size:

int length=s.size(); //Gives the size of the set.

//length is a size of set

Insert:

s.insert(x); //Inserts an integer x into the set s.

Erasing an element:

s.erase(val); //Erases an integer val from the set s.

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Solution:-

#include <cmath>

#include <cstdio>

#include <vector>

#include <iostream>

#include <set>

#include <algorithm>

using namespace std;

int main() 

{

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */

    int n;

    set<int>s;

    for(int i=0;i<n;i++)

        {

        int a;

        cin>>a;

        s.insert(a);

        }

    cin>>n;

    for(int i=0;i<n;i++)

        {

        int q,t;

        cin>>t>>q;

        switch(t)

            {

            case 1:

            {

                s.insert(q);

                break;

            }

            case 2:

            {

                s.erase(q);

                break;

            }

            case 3:

            {

                set<int>::iterator itr=s.find(q);

                if(itr==s.end())

                   cout<<"No"<<endl;

                else

                   cout<<"Yes"<<endl;

                break;

            }

            }

        }

    return 0;

}

Output:-

1. Compilation With Custom Input

2.All Testcase's 

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