Merge branch 'master' into patch06

problems/0202.快乐数.md

@@ -385,6 +385,7 @@ bool isHappy(int n){
     return bHappy;
 }
 ```
+
 Scala:
 ```scala
 object Solution {
@@ -416,6 +417,28 @@ object Solution {
     }
     sum
   }
+
+
+C#：
+```csharp
+public class Solution {
+    private int getSum(int n) {
+        int sum = 0;
+        //每位数的换算
+        while (n > 0) {
+            sum += (n % 10) * (n % 10);
+            n /= 10;
+        }
+        return sum;
+    }
+    public bool IsHappy(int n) {
+        HashSet <int> set = new HashSet<int>();
+        while(n != 1 && !set.Contains(n)) { //判断避免循环
+            set.Add(n);
+            n = getSum(n);
+        }
+        return n == 1;
+    }
 }
 ```
 -----------------------