New Problems Added

Author: coderjojo

leetcode/DailyQuestions/Day2.cpp

@@ -0,0 +1,37 @@
+class Solution {
+
+public:
+    
+    int rev(int n){
+        int sum = 0;
+        
+        while(n){
+            int val = n % 10;
+            n /= 10;
+            sum += val * val;
+        }
+        
+        return sum;
+    }
+    
+    
+    bool isHappy(int n) {
+        
+        unordered_set<int> nums;
+        while(1){
+            
+            if(n == 1)
+                return true;
+            
+            n = rev(n);
+            
+            if(nums.count(n) == 1)
+                return false;
+            
+            nums.insert(n);
+            
+        }
+        
+    }
+};
+

leetcode/DailyQuestions/day1.cpp

@@ -0,0 +1,12 @@
+class Solution {
+  public:
+    int singleNumber(vector<int>& nums) {
+            int num = 0;
+           
+            for(int a:nums){
+                        num ^= a;
+                    }
+            
+            return num;
+        }
+};