Added counting-bits

Author: avidLearnerInProgress

counting_bits.cpp

@@ -0,0 +1,11 @@
+class Solution {
+public:
+    vector<int> countBits(int num) {
+        vector<int> ans;
+        for(int i=0; i<=num; i++){
+            ans.push_back(__builtin_popcount(i));
+        }
+        return ans;
+    }
+    
+};