From 3c42027e5817b52aa171681ba03e36e737fd819e Mon Sep 17 00:00:00 2001
From: AdithyakrishnaV <adithyakr007@gmail.com>
Date: Thu, 23 Sep 2021 13:36:13 +0530
Subject: [PATCH] Hackerrank_c++

---
 .vscode/settings.json                         |   5 +
 Hackerrank_C++/Arrays_Introduction.cpp        |  32 +++++
 Hackerrank_C++/Attribute_Parser.cpp           |  83 +++++++++++++
 Hackerrank_C++/Basic_Data_Types.cpp           |  24 ++++
 Hackerrank_C++/Box_It!.cpp                    | 111 ++++++++++++++++++
 Hackerrank_C++/Class.cpp                      |  68 +++++++++++
 Hackerrank_C++/Classes and Objects.cpp        |  28 +++++
 Hackerrank_C++/Conditional_Statements.cpp     |  45 +++++++
 Hackerrank_C++/For_Loop.cpp                   |  23 ++++
 Hackerrank_C++/Functions.cpp                  |  36 ++++++
 Hackerrank_C++/Inherited_Code.cpp             |  51 ++++++++
 Hackerrank_C++/Input_and_Output.cpp           |  18 +++
 Hackerrank_C++/Lower_Bound_STL.cpp            |  33 ++++++
 Hackerrank_C++/Maps_STL.cpp                   |  38 ++++++
 Hackerrank_C++/Pointer.cpp                    |  21 ++++
 Hackerrank_C++/Say_Hello, World!_With_C++.cpp |   8 ++
 Hackerrank_C++/Sets_STL.cpp                   |  45 +++++++
 Hackerrank_C++/StringStream.cpp               |  18 +++
 Hackerrank_C++/Strings.cpp                    |  24 ++++
 Hackerrank_C++/Structs.cpp                    |  20 ++++
 Hackerrank_C++/Variable_Sized_Arrays.cpp      |  32 +++++
 Hackerrank_C++/Vector_Erase.cpp               |  28 +++++
 Hackerrank_C++/Vector_Sort.cpp                |  24 ++++
 23 files changed, 815 insertions(+)
 create mode 100644 .vscode/settings.json
 create mode 100644 Hackerrank_C++/Arrays_Introduction.cpp
 create mode 100644 Hackerrank_C++/Attribute_Parser.cpp
 create mode 100644 Hackerrank_C++/Basic_Data_Types.cpp
 create mode 100644 Hackerrank_C++/Box_It!.cpp
 create mode 100644 Hackerrank_C++/Class.cpp
 create mode 100644 Hackerrank_C++/Classes and Objects.cpp
 create mode 100644 Hackerrank_C++/Conditional_Statements.cpp
 create mode 100644 Hackerrank_C++/For_Loop.cpp
 create mode 100644 Hackerrank_C++/Functions.cpp
 create mode 100644 Hackerrank_C++/Inherited_Code.cpp
 create mode 100644 Hackerrank_C++/Input_and_Output.cpp
 create mode 100644 Hackerrank_C++/Lower_Bound_STL.cpp
 create mode 100644 Hackerrank_C++/Maps_STL.cpp
 create mode 100644 Hackerrank_C++/Pointer.cpp
 create mode 100644 Hackerrank_C++/Say_Hello, World!_With_C++.cpp
 create mode 100644 Hackerrank_C++/Sets_STL.cpp
 create mode 100644 Hackerrank_C++/StringStream.cpp
 create mode 100644 Hackerrank_C++/Strings.cpp
 create mode 100644 Hackerrank_C++/Structs.cpp
 create mode 100644 Hackerrank_C++/Variable_Sized_Arrays.cpp
 create mode 100644 Hackerrank_C++/Vector_Erase.cpp
 create mode 100644 Hackerrank_C++/Vector_Sort.cpp

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..57c2030
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "algorithm": "cpp"
+    }
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Arrays_Introduction.cpp b/Hackerrank_C++/Arrays_Introduction.cpp
new file mode 100644
index 0000000..4b70998
--- /dev/null
+++ b/Hackerrank_C++/Arrays_Introduction.cpp
@@ -0,0 +1,32 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    int n;
+    cin>>n;
+    int arr[n];
+    for(int i=0; i<n; i++){
+        cin>>arr[i];
+    }
+
+    int l=0, h=n-1;
+
+    while(l<h){
+        int temp=arr[l];
+        arr[l]=arr[h];
+        arr[h]=temp;
+        l++;
+        h--;
+    }
+      
+    for(int i=0; i<n; i++){
+        cout<<arr[i]<<" ";
+    }
+
+    return 0;
+}
diff --git a/Hackerrank_C++/Attribute_Parser.cpp b/Hackerrank_C++/Attribute_Parser.cpp
new file mode 100644
index 0000000..65ff28c
--- /dev/null
+++ b/Hackerrank_C++/Attribute_Parser.cpp
@@ -0,0 +1,83 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n, q,i;
+    cin>>n>>q;
+    string temp;
+    vector<string> hrml;
+    vector<string> quer;
+    cin.ignore();
+
+    for(i=0;i<n;i++)
+    {
+        getline(cin,temp);
+        hrml.push_back(temp);
+    }
+    for(i=0;i<q;i++)
+    {
+        getline(cin,temp);
+        quer.push_back(temp);
+    }
+
+    map<string, string> m;
+    vector<string> tag;
+
+    for(i=0;i<n;i++)
+    {
+        temp=hrml[i];
+        temp.erase(remove(temp.begin(), temp.end(), '\"' ),             temp.end());
+        temp.erase(remove(temp.begin(), temp.end(), '>' ),              temp.end());
+
+        if(temp.substr(0,2)=="</")
+        {
+            tag.pop_back();
+        }
+        else
+        {
+            stringstream ss;
+            ss.str("");
+            ss<<temp;
+            string t1,p1,v1;
+            char ch;
+            ss>>ch>>t1>>p1>>ch>>v1;
+            string temp1="";
+            if(tag.size()>0)
+            {
+                temp1=*tag.rbegin();
+                temp1=temp1+"."+t1;
+            }
+            else
+            {
+                temp1=t1;
+            }
+            tag.push_back(temp1);
+            m[*tag.rbegin()+"~"+p1]=v1;
+            while(ss)
+            {
+                ss>>p1>>ch>>v1;
+                m[*tag.rbegin()+"~"+p1]=v1;
+            }
+        }
+
+    }
+
+    for(i=0;i<q;i++)
+    {
+        if (m.find(quer[i]) == m.end())
+        {
+            cout << "Not Found!\n";
+        }
+        else
+        {
+            cout<<m[quer[i]]<<endl;
+        }
+    }
+    return 0;
+}
diff --git a/Hackerrank_C++/Basic_Data_Types.cpp b/Hackerrank_C++/Basic_Data_Types.cpp
new file mode 100644
index 0000000..5255193
--- /dev/null
+++ b/Hackerrank_C++/Basic_Data_Types.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <cstdio>
+#include <iomanip>
+using namespace std;
+int main()
+{
+    int a;
+    long b;
+    char c;
+    float d;
+    double e;
+    cin>>a;
+    cin>>b;
+    cin>>c;
+    cin>>d;
+    cin>>e;
+    cout << setprecision(20)<< a<< endl;
+    cout << setprecision(20)<< b<< endl;
+    cout << setprecision(20)<< c<< endl;
+    cout << setprecision(20)<< d<< endl;
+    cout << setprecision(20)<< e<< endl;
+    return 0;
+}
+
diff --git a/Hackerrank_C++/Box_It!.cpp b/Hackerrank_C++/Box_It!.cpp
new file mode 100644
index 0000000..88384de
--- /dev/null
+++ b/Hackerrank_C++/Box_It!.cpp
@@ -0,0 +1,111 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+//Implement the class Box  
+class Box{
+    private:
+      int l, b, h; //l,b,h are integers representing the dimensions of the box
+    public:
+       //Default
+      Box():l(0), b(0), h(0) {}
+      
+      Box(int x, int y, int z){
+          l = x;
+          b = y;
+          h = z;
+      }
+      
+      Box(const Box& B){
+        this->l = B.l;
+        this->b = B.b;
+        this->h = B.h;
+      }
+      
+        //Getter
+      int getLength() const {  //Return box's length
+          return l;
+      }
+      
+      int getBreadth() const { // Return box's breadth
+          return b;
+      }
+      
+      int getHeight() const {  //Return box's height
+          return h;  
+      }
+      
+      long long CalculateVolume(){  
+          long long volume =(long long) l*b*h;
+          return volume;                        // Return the volume of the box
+      }
+      
+      bool operator<(Box& other){
+          bool condition1 = l < other.l;
+          bool condition2 = b < other.b && l == other.l;
+          bool condition3 = h < other.h && b == other.b && h == other.h;
+          
+          if(condition1 || condition2 || condition1)
+              return true;
+              
+            return false;       
+      }
+       //Friend function
+      friend ostream& operator<<(ostream& out,  Box& B){
+          out << B.l <<" "<< B.b <<" "<< B.h;
+          return out;
+      }
+};
+
+
+void check2()
+{
+	int n;
+	cin>>n;
+	Box temp;
+	for(int i=0;i<n;i++)
+	{
+		int type;
+		cin>>type;
+		if(type ==1)
+		{
+			cout<<temp<<endl;
+		}
+		if(type == 2)
+		{
+			int l,b,h;
+			cin>>l>>b>>h;
+			Box NewBox(l,b,h);
+			temp=NewBox;
+			cout<<temp<<endl;
+		}
+		if(type==3)
+		{
+			int l,b,h;
+			cin>>l>>b>>h;
+			Box NewBox(l,b,h);
+			if(NewBox<temp)
+			{
+				cout<<"Lesser\n";
+			}
+			else
+			{
+				cout<<"Greater\n";
+			}
+		}
+		if(type==4)
+		{
+			cout<<temp.CalculateVolume()<<endl;
+		}
+		if(type==5)
+		{
+			Box NewBox(temp);
+			cout<<NewBox<<endl;
+		}
+
+	}
+}
+
+int main()
+{
+	check2();
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Class.cpp b/Hackerrank_C++/Class.cpp
new file mode 100644
index 0000000..7dd9dff
--- /dev/null
+++ b/Hackerrank_C++/Class.cpp
@@ -0,0 +1,68 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Student {
+  private: 
+        int m_age;
+        int m_standard;
+        string m_first_name;
+        string m_last_name;
+
+  public:
+
+    void set_age( int  age){
+        m_age = age;
+    }
+
+    void set_standard(int standard){
+        m_standard = standard;
+    }
+
+    void set_first_name(string firstName){
+        m_first_name = firstName;
+    }
+
+    void set_last_name(string lastName){
+        m_last_name = lastName;
+    }
+
+    int get_age(){
+        return m_age;
+    }
+
+    int get_standard(){
+        return m_standard;
+    }
+
+    string get_first_name(){
+        return m_first_name;
+    }
+
+    string get_last_name(){
+        return m_last_name;
+    }
+
+};
+ 
+
+
+int main(){
+    Student st;
+    int m_age, m_standard;
+    string m_first_name, m_last_name;
+    char c=',';
+    cin>>m_age>>m_first_name>>m_last_name>>m_standard;
+    
+    st.set_age(m_age);
+    st.set_first_name(m_first_name);
+    st.set_last_name(m_last_name);
+    st.set_standard(m_standard);
+
+    cout<<st.get_age()<<"\n";
+    cout<<st.get_last_name()<<c<<" "<<st.get_first_name()<<"\n";
+    cout<<st.get_standard()<<"\n";
+    cout<<"\n";
+    cout<<st.get_age()<<c<<st.get_first_name()<<c<<st.get_last_name()<<c<<st.get_standard();
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Classes and Objects.cpp b/Hackerrank_C++/Classes and Objects.cpp
new file mode 100644
index 0000000..bff7946
--- /dev/null
+++ b/Hackerrank_C++/Classes and Objects.cpp	
@@ -0,0 +1,28 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <cassert>
+using namespace std;
+
+class Student{
+  private:
+    int sum;
+    int m[5];
+  public:
+  Student(){
+    sum=0;
+  }
+     void input(){
+        for(int i=0; i<5; i++){
+          cin>>m[i];
+          sum+=m[i];
+        }
+     }
+     int calculateTotalScore(){
+        return sum;
+     }
+
+};
+int main() {
\ No newline at end of file
diff --git a/Hackerrank_C++/Conditional_Statements.cpp b/Hackerrank_C++/Conditional_Statements.cpp
new file mode 100644
index 0000000..4164ada
--- /dev/null
+++ b/Hackerrank_C++/Conditional_Statements.cpp
@@ -0,0 +1,45 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cin>>n;
+    
+        if(n==0){
+            cout << "zero ";
+            
+        }else if(n==1){
+            cout << "one ";
+            
+        }else if (n==2){
+            cout << "two ";
+            
+        }else if(n==3){
+            cout << "three ";
+            
+        }else if(n==4){
+            cout << "four ";
+            
+        }else if(n==5){
+            cout << "five ";
+            
+        }else if(n==6){
+            cout << "six ";
+            
+        }else if(n==7){
+            cout << "seven ";
+            
+        }else if(n==8){
+            cout << "eight ";
+            
+        }else if(n==9){
+            cout << "nine ";
+        }
+    else{
+        cout<<"Greater than 9";
+    }
+
+    return 0;
+}
diff --git a/Hackerrank_C++/For_Loop.cpp b/Hackerrank_C++/For_Loop.cpp
new file mode 100644
index 0000000..4baf83e
--- /dev/null
+++ b/Hackerrank_C++/For_Loop.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+
+int main() {
+    
+    int a,b,i;
+    char *str[] = {"one","two","three","four","five","six","seven","eight","nine","even","odd"};
+    cin>>a;
+    cin>>b;
+    for(i=a;i<=b;i++)
+    {
+        if(i<=9)
+        {
+            cout<<str[i-1]<<"\n";
+        }
+        else
+        {
+            cout<<str[9+(i%2)]<<"\n";
+        }
+    }
+    return 0;
+}
diff --git a/Hackerrank_C++/Functions.cpp b/Hackerrank_C++/Functions.cpp
new file mode 100644
index 0000000..8a46a8d
--- /dev/null
+++ b/Hackerrank_C++/Functions.cpp
@@ -0,0 +1,36 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+
+
+int max_of_four(int a, int b, int c, int d){
+     if(a>b && a>c){
+         if(a>d){
+             cout<<a;
+         }else{
+             cout<<d;
+         }
+     }else if(b>c){
+        if(b>d){
+            cout<<b;
+        }else{
+            cout<<d;
+        }
+     }else if(c>d){
+            cout<<c;
+     }else{
+         cout<<d;
+     }
+    return 0;
+ };
+ 
+int main() {
+    int a, b, c, d;
+    cin>>a;
+    cin>>b;
+    cin>>c;
+    cin>>d;
+    max_of_four(a, b, c, d);  
+    
+    return 0;
+}
diff --git a/Hackerrank_C++/Inherited_Code.cpp b/Hackerrank_C++/Inherited_Code.cpp
new file mode 100644
index 0000000..372733e
--- /dev/null
+++ b/Hackerrank_C++/Inherited_Code.cpp
@@ -0,0 +1,51 @@
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <exception>
+using namespace std;
+
+class BadLengthException{
+    private:
+      int num;
+    public:
+      BadLengthException(int n) : num(n) {}
+      
+      //Getter
+      int what() {
+          return num;
+      }
+};
+
+
+bool checkUsername(string username) {
+	bool isValid = true;
+	int n = username.length();
+	if(n < 5) {
+		throw BadLengthException(n);
+	}
+	for(int i = 0; i < n-1; i++) {
+		if(username[i] == 'w' && username[i+1] == 'w') {
+			isValid = false;
+		}
+	}
+	return isValid;
+}
+
+int main() {
+	int T; cin >> T;
+	while(T--) {
+		string username;
+		cin >> username;
+		try {
+			bool isValid = checkUsername(username);
+			if(isValid) {
+				cout << "Valid" << '\n';
+			} else {
+				cout << "Invalid" << '\n';
+			}
+		} catch (BadLengthException e) {
+			cout << "Too short: " << e.what() << '\n';
+		}
+	}
+	return 0;
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Input_and_Output.cpp b/Hackerrank_C++/Input_and_Output.cpp
new file mode 100644
index 0000000..89d4f0f
--- /dev/null
+++ b/Hackerrank_C++/Input_and_Output.cpp
@@ -0,0 +1,18 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+       
+    int a;
+    int b;
+    int c;
+    cin>>a>>b>>c;
+    int sum = a+b+c;
+    cout<<sum<<"\n";
+    return 0;
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Lower_Bound_STL.cpp b/Hackerrank_C++/Lower_Bound_STL.cpp
new file mode 100644
index 0000000..360d047
--- /dev/null
+++ b/Hackerrank_C++/Lower_Bound_STL.cpp
@@ -0,0 +1,33 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    long n, a, q, query;
+    cin>>n;
+    vector<long> v;
+    
+    for(int i=0; i<n; i++){
+        cin>>a;
+        v.push_back(a);
+    }
+    
+    cin>>q;
+    
+    for(int i=0; i<q; i++){
+        cin>>query;
+        
+        vector<long>::iterator itr = lower_bound(v.begin(),              v.end(), query);
+        if(query != *itr){
+            cout<< "No " <<(itr - v.begin()+1) << endl;
+        }else{
+            cout<< "Yes " <<(itr - v.begin()+1) << endl;
+        }
+    }
+      
+    return 0;
+}
diff --git a/Hackerrank_C++/Maps_STL.cpp b/Hackerrank_C++/Maps_STL.cpp
new file mode 100644
index 0000000..587e26d
--- /dev/null
+++ b/Hackerrank_C++/Maps_STL.cpp
@@ -0,0 +1,38 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <set>
+#include <map>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    int q;
+    cin>>q;
+    map<string, int>mp;
+    while(q--){
+        int type;
+        cin>>type;
+        if(type == 1){
+            string name;
+            int mark;
+            cin>>name>>mark;
+            if(mp.find(name) != mp.end()){
+                mp[name] = mp[name] + mark;
+            }else{
+                mp.insert(make_pair(name,mark));
+            }
+        }else if(type == 2){
+            string name;
+            cin>>name;
+            mp[name] = 0;
+        }else if(type == 3){
+            string name;
+            cin>>name;
+            cout<<mp[name]<<endl;
+        }
+    }  
+    return 0;
+}
diff --git a/Hackerrank_C++/Pointer.cpp b/Hackerrank_C++/Pointer.cpp
new file mode 100644
index 0000000..a625265
--- /dev/null
+++ b/Hackerrank_C++/Pointer.cpp
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+void update(int *a,int *b) {
+    int temp=*a;
+    *a=*a+*b;
+    *b=temp-*b;
+    if(*b<0){
+        *b=-*b;
+    }  
+}
+
+int main() {
+    int a, b;
+    int *pa = &a, *pb = &b;
+    
+    scanf("%d %d", &a, &b);
+    update(pa, pb);
+    printf("%d\n%d", a, b);
+
+    return 0;
+}
diff --git a/Hackerrank_C++/Say_Hello, World!_With_C++.cpp b/Hackerrank_C++/Say_Hello, World!_With_C++.cpp
new file mode 100644
index 0000000..b4c6dab
--- /dev/null
+++ b/Hackerrank_C++/Say_Hello, World!_With_C++.cpp	
@@ -0,0 +1,8 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+
+int main() {
+    cout<<"Hello, World!";
+    return 0;
+}
\ No newline at end of file
diff --git a/Hackerrank_C++/Sets_STL.cpp b/Hackerrank_C++/Sets_STL.cpp
new file mode 100644
index 0000000..7c506aa
--- /dev/null
+++ b/Hackerrank_C++/Sets_STL.cpp
@@ -0,0 +1,45 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <set>
+#include <algorithm>
+#include <string>
+#include <sstream>
+using namespace std;
+
+
+int main() {
+      set<int> s;
+      int n;
+      cin>>n;
+      
+      for(int i=0; i<=n; i++){
+          string query_input;
+          int query_type, query_number;
+          getline(cin, query_input);
+          
+          if(query_input.size() > 1) {
+              istringstream ss(query_input);
+              ss >> query_type >> query_number;
+              
+              switch(query_type){
+                  case 1:
+                      s.insert(query_number);
+                      break;
+                  case 2:
+                      s.erase(query_number);
+                      break;
+                  case 3:
+                      set<int>::iterator it = s.find(query_number);
+                  
+                  if(it == s.end()){
+                      cout<< "No" << endl;
+                  }else{
+                      cout<< "Yes" << endl;
+                  }
+              }
+          }
+      }
+    return 0;
+}
diff --git a/Hackerrank_C++/StringStream.cpp b/Hackerrank_C++/StringStream.cpp
new file mode 100644
index 0000000..f0f42e3
--- /dev/null
+++ b/Hackerrank_C++/StringStream.cpp
@@ -0,0 +1,18 @@
+#include <sstream>
+#include <iostream>
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    string str;
+    cin>>str;
+    for (int i=0; i<str.size(); i++){
+        if(str[i]!=','){
+          cout<<str.at(i);
+        }else{
+            cout<<"\n";
+        }
+    }
+    
+    return 0;
+}
diff --git a/Hackerrank_C++/Strings.cpp b/Hackerrank_C++/Strings.cpp
new file mode 100644
index 0000000..6bd85c8
--- /dev/null
+++ b/Hackerrank_C++/Strings.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+int main() {
+    string a, b, c;
+    cin>>a;
+    cin>>b;
+    int n, m;
+    n=a.size();//find length
+    m=b.size();//find length
+    c=a+b;
+    
+    char temp=a.at(0);
+    a.at(0)=b.at(0);
+    b.at(0)=temp;
+    
+    
+    cout<<n<<" "<<m<<"\n";
+    cout<<c<<"\n";
+    cout<<a<<" "<<b;
+  
+    return 0;
+}
diff --git a/Hackerrank_C++/Structs.cpp b/Hackerrank_C++/Structs.cpp
new file mode 100644
index 0000000..67b0578
--- /dev/null
+++ b/Hackerrank_C++/Structs.cpp
@@ -0,0 +1,20 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    int a, d;
+    string b, c;
+    cin>>a;
+    cin>>b;
+    cin>>c;
+    cin>>d;
+    
+    cout<<a<<" "<<b<<" "<<c<<" "<<d;
+    
+    return 0;
+}
diff --git a/Hackerrank_C++/Variable_Sized_Arrays.cpp b/Hackerrank_C++/Variable_Sized_Arrays.cpp
new file mode 100644
index 0000000..f7e78fa
--- /dev/null
+++ b/Hackerrank_C++/Variable_Sized_Arrays.cpp
@@ -0,0 +1,32 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    int n, q;
+    cin>> n >> q;
+    vector<int> arr[n];
+    for(int i=0; i<n; i++){
+        int s;
+        cin>>s;
+
+         int o;
+       for(int j=0; j<s; j++){
+           cin>>o;
+           arr[i].push_back(o);
+       }
+    }
+
+    int r, s;
+    for(int k=0; k<q; k++){
+        cin>>r>>s;
+        cout<<arr[r][s]<<endl;
+    }
+
+
+    return 0;
+}
diff --git a/Hackerrank_C++/Vector_Erase.cpp b/Hackerrank_C++/Vector_Erase.cpp
new file mode 100644
index 0000000..65c9917
--- /dev/null
+++ b/Hackerrank_C++/Vector_Erase.cpp
@@ -0,0 +1,28 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    vector<int> v;
+    int x, y, z;
+    int n;
+    cin>>n;
+    for(int i=0; i<n; i++){
+        cin>>x;
+        v.push_back(x);
+    }
+    int a1, a2, a3;
+    cin>>a1;
+    cin>>a2>>a3;
+    v.erase(v.begin()+a1-1);
+    v.erase(v.begin()+a2-1, v.begin()+a3-1);
+    cout<<v.size()<<endl;
+    for(int i=0; i<v.size(); i++){
+        cout<<v.at(i)<<" ";
+    }
+    return 0;
+}
diff --git a/Hackerrank_C++/Vector_Sort.cpp b/Hackerrank_C++/Vector_Sort.cpp
new file mode 100644
index 0000000..362d006
--- /dev/null
+++ b/Hackerrank_C++/Vector_Sort.cpp
@@ -0,0 +1,24 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+int main() {
+    int n;
+    cin>>n;
+    
+    int arr[n];
+    for(int i=0; i<n; i++){
+        cin>>arr[i];
+    }
+    
+     sort(arr, arr+n);
+     
+    for(int i=0; i<n; i++){
+        cout<<arr[i]<<" ";
+    }
+    return 0;
+}