new file: P10448.cpp

P10448.cpp

@@ -0,0 +1,30 @@
+// 93
+#include <cstdio>
+using namespace std;
+bool ch[50];
+int n, m;
+void dfs(int count, int now)
+{
+    if (now > n)
+    {
+        if (count != m)
+            return;
+        for (int i = 1; i <= n; ++i)
+        {
+            if (ch[i])
+                printf("%d ", i);
+        }
+        puts("");
+        return;
+    }
+    ch[now] = 1;
+    dfs(count + 1, now + 1);
+    ch[now] = 0;
+    dfs(count, now + 1);
+}
+int main()
+{
+    scanf("%d%d", &n, &m);
+    dfs(0, 1);
+    return 0;
+}