Create 476. Number Complement (#564)

Author: Chayandas07

476. Number Complement

@@ -0,0 +1,9 @@
+class Solution {
+public:
+    int findComplement(int num) {
+        int shift = (log10(num) / log10(2)) + 1;
+        int mask = -1 << shift;
+        mask ^= -1;
+        return mask ^ num;
+    }
+};