initial version

tree.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include "lceb.h"
+
+void gen_tree(seq, n, nb1, nb0)
+    int *seq;
+    int n;                      /* number of nodes */
+    int nb1;                    /* number of "1" */
+    int nb0;                    /* number of "0" */
+{
+    int i;
+
+     if((nb1 + nb0) == 2*n) {   /* end */
+        seq[2*n] = 0;
+        printf("tree=");
+        for (i=0; i<=2*n; ++i)
+            printf("%d", seq[i]);
+        putchar('\n');
+        return;
+     }
+
+    if(nb1 >= nb0 && nb1 < n) {
+        seq[nb1+nb0] = 1;
+        gen_tree(seq, n, nb1+1, nb0);
+    }
+
+    if(nb0 < nb1 && nb1 <=n) {
+        seq[nb1+nb0] = 0;
+        gen_tree(seq, n, nb1, nb0+1);
+    }
+}
+
+#ifdef STANDALONE
+main(ac, av)
+    int ac;
+    char **av;
+{
+    int n;
+    int array[1024];
+    n=atoi(av[1]);
+    gen_tree(array, n, 0, 0);
+    exit(0);
+}
+#endif