Add solution to 'a lot' of problems

Easy/reverse-bits/solution.cpp

@@ -0,0 +1,17 @@
+#include <cmath>
+#include <cstdint>
+
+class Solution {
+public:
+    uint32_t reverseBits(uint32_t n) {
+        uint32_t r = 0;
+        for (int i = 31; i >= 0; --i) {
+            if (n / (uint32_t)std::pow(2, i) >= 1) {
+                n -= (uint32_t)std::pow(2, i);
+                r += (uint32_t)std::pow(2, 31 - i);
+            }
+        }
+
+        return r;
+    }
+};