Happy Number (codedecks-in#51)

* Happy Number

* Power of Three

* Power of Three

* Solution without HashSet

* Update README.md

* Updated readme

* Update README.md

Author: ifenil

Java/Happy-Number.java

@@ -0,0 +1,31 @@
+class HappyNumber {
+    public boolean isHappy(int n) {
+        int num1, num2; 
+   
+    num1 = num2 = n; 
+    do
+    { 
+        num1 = SquareSum(num1); 
+   
+         
+        num2 = SquareSum(SquareSum(num2)); 
+   
+    } 
+    while (num1 != num2); 
+   
+    return (num1 == 1); 
+} 
+
+
+static int SquareSum(int n) 
+    { 
+        int square = 0; 
+        while (n!= 0) 
+        { 
+            square += (n % 10) * (n % 10); 
+            n /= 10; 
+        } 
+    return square; 
+    } 
+ 
+}

Java/Power-of-Three.java

@@ -0,0 +1,15 @@
+class Solution {
+    public boolean isPowerOfThree(int n) {
+        
+        if(n < 1)
+        {
+            return false;
+        }
+        
+        while(n % 3 == 0)
+        {
+            n = n/3;
+        }
+        return n==1;
+    }
+}

README.md

@@ -231,7 +231,8 @@ Check out ---> [Sample PR](https://github.com/codedecks-in/LeetCode-Solutions/pu
 | 204 | [Count Primes](https://leetcode.com/problems/count-primes)                         | [C++](./C++/Count-Primes.cpp)                                             | _O(n(log(logn)))_ | _O(n)_ | Easy       | Math   |      |
 | 168 | [Excel Sheet Column Title](https://leetcode.com/problems/excel-sheet-column-title) | [C++](./C++/Excel-Sheet-Column-Title.cpp)                                 | _O(n)_            | _O(n)_ | Easy       | String |      |
 | 007 | [Reverse Integer](https://leetcode.com/problems/reverse-integer)                   | [Java](./Java/reverse-integer.java) <br> [C++](./C++/Reverse-Integer.cpp) | _O(n)_            | _O(n)_ | Easy       | Math   |      |
-
+| 202 | [Happy Number](https://leetcode.com/problems/happy-number)                         | [Java](./Java/Happy-Number.java)                                          | _O(n^2)_          | _O(n)_ | Easy       | Math   |      |
+| 326 | [Power of Three](https://leetcode.com/problems/power-of-three)                         | [Java](./Java/Power-of-Three.java)                                         | _O(logn)_          | _O(n)_ | Easy       | Math   |      |
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@@ -363,10 +364,12 @@ DISCLAIMER: This above mentioned resources have affiliate links, which means if
 | [Girish Thatte](https://github.com/girishgr8/) <br> <img src="https://github.com/girishgr8.png" width="100" height="100">                        | India   | Java                 | [Leetcode](https://leetcode.com/girish13/) <br> [Hackerrank](https://www.hackerrank.com/procoder_13) <br> [Codechef](https://www.codechef.com/procoder_13)            |
 | [Kevin Chittilapilly](https://github.com/KevinChittilapilly) <br> <img src="https://github.com/KevinChittilapilly.png" width="100" height="100"> | India   | Java                 | [Leetcode](https://leetcode.com/being_kevin/) <br> [Hackerrank](https://www.hackerrank.com/ckevinvarghese11) <br> [Kaggle](https://www.kaggle.com/kevinchittilapilly) |
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-|[Avinash Trivedi](https://github.com/trivediavinash)  <br>   <img src="https://github.com/trivediavinash.png" width="100" height="100"> |India | C++    |   [Leetcode](https://leetcode.com/avi_002/) |
-|[Ishika Goel](https://github.com/ishikagoel5628)  <br>  <img src="https://github.com/Nour-Grati.png" width="100" height="100">   | India | C++ | [Leetcode](https://leetcode.com/ishikagoel5628/) |
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+| [Avinash Trivedi](https://github.com/trivediavinash)  <br>   <img src="https://github.com/trivediavinash.png" width="100" height="100">          | India   | C++                  | [Leetcode](https://leetcode.com/avi_002/) |
+| [Ishika Goel](https://github.com/ishikagoel5628)  <br>  <img src="https://github.com/Nour-Grati.png" width="100" height="100">                   | India   | C++                  | [Leetcode](https://leetcode.com/ishikagoel5628/) |
+| [Fenil Dobariya](https://github.com/ifenil)  <br>  <img src="https://rb.gy/iascx3" width="100" height="100">                                     | India   | Java                 | [Github](https://github.com/ifenil) |                                
+| [Prashansa Tanwar](https://github.com/prashansatanwar)  <br>  <img src="https://github.com/prashansatanwar.png" width="100" height="100">        | India   | C++                  | [Leetcode](https://leetcode.com/prashansaaa/) | 
+| [Ishu Raj](https://github.com/ir2010)  <br>  <img src="https://github.com/ir2010.png" width="100" height="100">   | India | C++ | [Leetcode](https://leetcode.com/ishuraj2010/) |
+
 
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