__what is recursion:-__

In programming language whenever any function calls itself then such call are called recursive calls and this phenomena is called recursion.

**Example:-**

Here in this example function

**f()**is calling itself so it is a recursive call.There are two types of recursion based on whether function directly calls itself or it is called via some other function.

**In direct recursion the recursion call to the function is directly written inside the body of the function.**

__(1). Direct recursion :-____(2). Indirect recursion :--__

In Indirect recursion the recursive Call to the function is not directly written inside the body of the function rather this Call lies inside some other function which is invoked (called) from the base function. The Indirect recursion is show at below.

Here f1 function is called by base function f and the recursive call to function f lies in the body of the function f1.

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__Hackerearth Problems:-__

- Very Cool numbers | Hacker earth solution
- Vowel Recognition | Hackerearth practice problem solution
- Birthday party | Hacker earth solution
- Most frequent | hacker earth problem solution
- program to find symetric difference of two sets
- cost of balloons | Hacker earth problem solution
- Chacha o chacha | hacker earth problem solution
- jadu and dna | hacker earth solution
- Bricks game | hacker earth problem
- Anti-Palindrome strings | hacker earth solution
- connected components in the graph | hacker earth data structure
- odd one out || hacker earth problem solution
- Minimum addition | Hackerearth Practice problem
- The magical mountain | Hackerearth Practice problem
- The first overtake | Hackerearth Practice problem

__Hackerrank Problems:-__- Playing With Characters | Hackerrank practice problem solution
- Sum and Difference of Two Numbers | hackerrank practice problem solution
- Functions in C | hackerrank practice problem solution
- Pointers in C | hackerrank practice problem solution
- Conditional Statements in C | Hackerrank practice problem solution
- For Loop in C | hackerrank practice problem solution
- Sum of Digits of a Five Digit Number | hackerrank practice problem solution
- 1D Arrays in C | hackerrank practice problem solution
- Array Reversal | hackerrank practice problem solution
- Printing Tokens | hackerrank practice problem solution
- Digit Frequency | hackerrank practice problem solution
- Calculate the Nth term | hackerrank practice problem solution

__Data structure:-__

- Program to find cycle in the graph
- Implementation of singly link list
- Implementation of queue by using link list
- Algorithm of quick sort
- stack by using link list
- program to find preorder post order and inorder of the binary search tree
- Minimum weight of spanning tree
- Preorder, inorder and post order traversal of the tree

__ MCQs:-__