new file: 6.cpp

6.cpp

@@ -0,0 +1,27 @@
+// 92
+#include <cstdio>
+using namespace std;
+int c;
+int n;
+void dfs(int now)
+{
+    if (now == n)
+    {
+        for (int i = 1; i <= n; ++i)
+        {
+            if (c & (1 << i))
+                printf("%d ", i);
+        }
+        puts("");
+        return;
+    }
+    dfs(now + 1);
+    c &= (1 << now);
+    dfs(now + 1);
+}
+int main()
+{
+    scanf("%d", &n);
+    dfs(1);
+    return 0;
+}