Hackerrank 30 days of code solutions added

30 days of code Solutions/Day-0.cpp

@@ -0,0 +1,25 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+//--------------------------------------------------------------------
+
+
+int main() 
+{
+
+    string input_string; 
+
+    getline(cin, input_string); 
+
+    cout << "Hello, World." << endl;
+
+    cout << input_string << endl;
+
+
+    return 0;
+}

30 days of code Solutions/Day-1.cpp

@@ -0,0 +1,26 @@
+#include <iostream>
+#include <iomanip>
+#include <limits>
+
+using namespace std;
+
+int main() {
+    int i = 4;
+    double d = 4.0;
+    string s = "HackerRank ";
+
+//-----------------------------------------------------------------
+
+
+   int lo;
+   string lo2;
+   double lo3;
+    cin >> lo >> lo3 >> lo2;
+
+    cout << lo + i << endl;
+    cout <<  lo3 + d << endl;
+    cout << s << lo2 << endl;
+
+//---------------------------------------------------------------------
+    return 0;
+}

30 days of code Solutions/Day-10.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <bitset>
+
+using namespace std;
+
+bool desc(int i, int l){return (i > l);}
+
+int main(){
+    int n;
+    cin >> n;
+    vector<int> ones;
+    bitset<32> m(n);
+    string ip = m.to_string();
+    int cnt = 0;
+    for(int m = 0; m < ip.size(); ++m){
+        if(ip[m] == '1'){
+            ++cnt;
+        }
+        else{
+            ones.push_back(cnt);
+            cnt = 0;
+        }
+        if(m == ip.size() - 1){
+            ones.push_back(cnt);
+        }
+    }
+    sort(ones.begin(), ones.end(), desc);
+    cout << ones.at(0) << endl;
+    return 0;
+}

30 days of code Solutions/Day-11.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+vector<vector<int> >lmao;
+vector<int> answers;
+
+bool desc(int i, int k){return i > k;}
+
+int TakeInput(int i, int m)
+{
+	for(int f = 0; f < i; ++f){
+		vector<int> temp;
+		for(int a = 0; a < m; ++a){
+			int x;
+			cin >> x;
+			temp.push_back(x);
+		}
+		lmao.push_back(temp);
+	}
+	return 0;
+}
+
+void compute()
+{
+	for(int i = 0; i < lmao.size() - 2; ++i){
+		for(int e = 0; e < lmao[i].size() - 2; ++e){
+			int sum = lmao[i][e] + lmao[i][e+1] + lmao[i][e+2] + lmao[i+1][e+1] +lmao[i+2][e] + lmao[i+2][e+1] + lmao[i+2][e+2];
+			answers.push_back(sum);
+		}
+	}
+}
+int main()
+{
+	TakeInput(6, 6);
+	compute();
+	sort(answers.begin(), answers.end(), desc);
+	cout << answers.at(0) << endl;
+}

30 days of code Solutions/Day-12.cpp

@@ -0,0 +1,78 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+
+class Person{
+	protected:
+		string firstName;
+		string lastName;
+		int id;
+	public:
+		Person(string firstName, string lastName, int identification){
+			this->firstName = firstName;
+			this->lastName = lastName;
+			this->id = identification;
+		}
+		void printPerson(){
+			cout<< "Name: "<< lastName << ", "<< firstName <<"\nID: "<< id << "\n"; 
+		}
+
+};
+
+//-------------------------------------------------------------------------
+
+class Student :  public Person{
+    private:
+        vector<int> testScores;  
+    public:
+        Student(string firstName, string lastName, int identification, vector<int> scores) : Person(firstName, lastName, identification), testScores(scores) { }   
+
+        char calculate() {
+            int average = 0;
+            for(int i = 0; i < testScores.size(); i++) {
+                average += testScores[i];
+            }
+            average = average / testScores.size();
+
+            if(average >= 90) {
+                return 'O'; // Outstanding
+            }
+            else if(average >= 80) {
+                return 'E'; // Exceeds Expectations
+            }
+            else if(average >= 70) {
+                return 'A'; // Acceptable
+            }
+            else if(average >= 55) {
+                return 'P'; // Poor
+            }
+            else if(average >= 40) {
+                return 'D'; // Dreadful
+            }
+            else {
+                return 'T'; // Troll
+            }
+        }
+};
+
+//-------------------------------------------------------------------------
+
+int main() {
+	string firstName;
+  	string lastName;
+	int id;
+  	int numScores;
+	cin >> firstName >> lastName >> id >> numScores;
+  	vector<int> scores;
+  	for(int i = 0; i < numScores; i++){
+	  	int tmpScore;
+	  	cin >> tmpScore;
+		scores.push_back(tmpScore);
+	}
+	Student* s = new Student(firstName, lastName, id, scores);
+	s->printPerson();
+	cout << "Grade: " << s->calculate() << "\n";
+	return 0;
+}

30 days of code Solutions/Day-13.cpp

@@ -0,0 +1,46 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <string>
+using namespace std;
+class Book{
+    protected:
+        string title;
+        string author;
+    public:
+        Book(string t,string a){
+            title=t;
+            author=a;
+        }
+        virtual void display()=0;
+
+};
+
+//--------------------------------------------------------------------
+
+class MyBook : public Book {
+    protected:
+    int price;
+    public:
+    MyBook(string title, string author, int price) : Book(title, author), price(price) { }
+    void display(){
+        cout << "Title: " << title << endl;
+        cout << "Author: " << author << endl;
+        cout << "Price: " << price << endl;
+    }
+};
+
+//---------------------------------------------------------------------
+
+int main() {
+    string title,author;
+    int price;
+    getline(cin,title);
+    getline(cin,author);
+    cin>>price;
+    MyBook novel(title,author,price);
+    novel.display();
+    return 0;
+}

30 days of code Solutions/Day-14.cpp

@@ -0,0 +1,48 @@
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+class Difference {
+    private:
+    vector<int> elements;
+
+  	public:
+  	int maximumDifference;
+
+//------------------------------------------------------------------------------------
+
+	Difference(vector<int> elm) : elements(elm) {}
+    void computeDifference(){
+        sort(elements.begin(), elements.end(), greater<int>());
+        maximumDifference = elements.at(0) - elements.at(elements.size() - 1);
+    }
+
+//--------------------------------------------------------------------------------------
+
+}; // End of Difference class
+
+int main() {
+    int N;
+    cin >> N;
+
+    vector<int> a;
+
+    for (int i = 0; i < N; i++) {
+        int e;
+        cin >> e;
+
+        a.push_back(e);
+    }
+
+    Difference d(a);
+
+    d.computeDifference();
+
+    cout << d.maximumDifference;
+
+    return 0;
+}

30 days of code Solutions/Day-15.cpp

@@ -0,0 +1,60 @@
+#include <iostream>
+#include <cstddef>
+using namespace std;	
+class Node
+{
+    public:
+        int data;
+        Node *next;
+        Node(int d){
+            data=d;
+            next=NULL;
+        }
+};
+class Solution{
+    public:        
+
+//------------------------------------------------------------
+
+      Node* insert(Node *head,int data)
+      {
+          if(head == NULL){
+              head = new Node(data);
+              return head;
+          }
+          else if(head->next == NULL){
+              Node *temp = new Node(data);
+              head->next = temp;
+              return head;
+          }
+          else{
+              insert(head->next, data);
+          }
+          return head;
+      }
+
+//--------------------------------------------------------------
+
+      void display(Node *head)
+      {
+          Node *start=head;
+          while(start)
+          {
+              cout<<start->data<<" ";
+              start=start->next;
+          }
+      }
+};
+int main()
+{
+	Node* head=NULL;
+  	Solution mylist;
+    int T,data;
+    cin>>T;
+    while(T-->0){
+        cin>>data;
+        head=mylist.insert(head,data);
+    }	
+	mylist.display(head);
+
+}

30 days of code Solutions/Day-16.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+using namespace std;
+
+
+int main(){
+    string S;
+    cin >> S;
+    try{
+        int no;
+        no = stoi(S);
+        cout << no << endl;
+    }
+    catch(exception e){
+        cout << "Bad String" << endl;
+    }
+    return 0;
+}