add: 220526 [cpp]

cpp/2205/220526.cpp

@@ -0,0 +1,13 @@
+#include <cstdint>
+
+/**
+ * 191. Number of 1 Bits
+ * Write a function that takes an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight).
+ */
+
+class Solution {
+public:
+	int hammingWeight(uint32_t n) {
+		return __builtin_popcount(n);
+	}
+};