Happy Number

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

@@ -226,7 +226,8 @@ 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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@@ -357,10 +358,12 @@ DISCLAIMER: This above mentioned resources have affiliate links, which means if
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+
 
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