修改目录结构，优化CMakeLists

src/191.c

@@ -0,0 +1,39 @@
+#define S2
+
+int hammingWeight(int n)
+{
+#ifdef S1
+    int weight = 0;
+    for (int i = 0; i < 32; i++)
+        if (n & (1u << i))
+            weight++;
+
+    return weight;
+#endif
+
+#ifdef S1_O
+    int weight = 0;
+    while (n)
+    {
+        n &= n - 1;
+        weight++;
+    }
+
+    return weight++;
+#endif
+
+#ifdef S2
+    unsigned i = (unsigned)n;
+    i = i - ((i >> 1) & 0x55555555);
+    i = (i & 0x33333333) + ((i >> 2) & 0x33333333);
+    i = (i + (i >> 4)) & 0x0f0f0f0f;
+    i = i + (i >> 8);
+    i = i + (i >> 16);
+    return (int)(i & 0x3f);
+#endif
+}
+
+int main()
+{
+    return 0;
+}