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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define SYMBOLS "hu4-"
  6.  
  7. void recurse(char *x, int currlevel, int maxlevel) {
  8. if (currlevel == maxlevel) {
  9. // last level
  10. printf("%s\n", x);
  11. } else {
  12. // add one level
  13. for (int k = 0; k < strlen(SYMBOLS); k++) {
  14. x[currlevel] = SYMBOLS[k];
  15. recurse(x, currlevel + 1, maxlevel);
  16. }
  17. }
  18. }
  19.  
  20. int main(void) {
  21. int loops = 5;
  22. char *x = calloc(loops + 1, 1); // assume OK
  23. recurse(x, 0, loops);
  24. free(x);
  25. return 0;
  26. }
  27.  
Success #stdin #stdout 0s 5280KB
stdin
Standard input is empty
stdout
hhhhh
hhhhu
hhhh4
hhhh-
hhhuh
hhhuu
hhhu4
hhhu-
hhh4h
hhh4u
hhh44
hhh4-
hhh-h
hhh-u
hhh-4
hhh--
hhuhh
hhuhu
hhuh4
hhuh-
hhuuh
hhuuu
hhuu4
hhuu-
hhu4h
hhu4u
hhu44
hhu4-
hhu-h
hhu-u
hhu-4
hhu--
hh4hh
hh4hu
hh4h4
hh4h-
hh4uh
hh4uu
hh4u4
hh4u-
hh44h
hh44u
hh444
hh44-
hh4-h
hh4-u
hh4-4
hh4--
hh-hh
hh-hu
hh-h4
hh-h-
hh-uh
hh-uu
hh-u4
hh-u-
hh-4h
hh-4u
hh-44
hh-4-
hh--h
hh--u
hh--4
hh---
huhhh
huhhu
huhh4
huhh-
huhuh
huhuu
huhu4
huhu-
huh4h
huh4u
huh44
huh4-
huh-h
huh-u
huh-4
huh--
huuhh
huuhu
huuh4
huuh-
huuuh
huuuu
huuu4
huuu-
huu4h
huu4u
huu44
huu4-
huu-h
huu-u
huu-4
huu--
hu4hh
hu4hu
hu4h4
hu4h-
hu4uh
hu4uu
hu4u4
hu4u-
hu44h
hu44u
hu444
hu44-
hu4-h
hu4-u
hu4-4
hu4--
hu-hh
hu-hu
hu-h4
hu-h-
hu-uh
hu-uu
hu-u4
hu-u-
hu-4h
hu-4u
hu-44
hu-4-
hu--h
hu--u
hu--4
hu---
h4hhh
h4hhu
h4hh4
h4hh-
h4huh
h4huu
h4hu4
h4hu-
h4h4h
h4h4u
h4h44
h4h4-
h4h-h
h4h-u
h4h-4
h4h--
h4uhh
h4uhu
h4uh4
h4uh-
h4uuh
h4uuu
h4uu4
h4uu-
h4u4h
h4u4u
h4u44
h4u4-
h4u-h
h4u-u
h4u-4
h4u--
h44hh
h44hu
h44h4
h44h-
h44uh
h44uu
h44u4
h44u-
h444h
h444u
h4444
h444-
h44-h
h44-u
h44-4
h44--
h4-hh
h4-hu
h4-h4
h4-h-
h4-uh
h4-uu
h4-u4
h4-u-
h4-4h
h4-4u
h4-44
h4-4-
h4--h
h4--u
h4--4
h4---
h-hhh
h-hhu
h-hh4
h-hh-
h-huh
h-huu
h-hu4
h-hu-
h-h4h
h-h4u
h-h44
h-h4-
h-h-h
h-h-u
h-h-4
h-h--
h-uhh
h-uhu
h-uh4
h-uh-
h-uuh
h-uuu
h-uu4
h-uu-
h-u4h
h-u4u
h-u44
h-u4-
h-u-h
h-u-u
h-u-4
h-u--
h-4hh
h-4hu
h-4h4
h-4h-
h-4uh
h-4uu
h-4u4
h-4u-
h-44h
h-44u
h-444
h-44-
h-4-h
h-4-u
h-4-4
h-4--
h--hh
h--hu
h--h4
h--h-
h--uh
h--uu
h--u4
h--u-
h--4h
h--4u
h--44
h--4-
h---h
h---u
h---4
h----
uhhhh
uhhhu
uhhh4
uhhh-
uhhuh
uhhuu
uhhu4
uhhu-
uhh4h
uhh4u
uhh44
uhh4-
uhh-h
uhh-u
uhh-4
uhh--
uhuhh
uhuhu
uhuh4
uhuh-
uhuuh
uhuuu
uhuu4
uhuu-
uhu4h
uhu4u
uhu44
uhu4-
uhu-h
uhu-u
uhu-4
uhu--
uh4hh
uh4hu
uh4h4
uh4h-
uh4uh
uh4uu
uh4u4
uh4u-
uh44h
uh44u
uh444
uh44-
uh4-h
uh4-u
uh4-4
uh4--
uh-hh
uh-hu
uh-h4
uh-h-
uh-uh
uh-uu
uh-u4
uh-u-
uh-4h
uh-4u
uh-44
uh-4-
uh--h
uh--u
uh--4
uh---
uuhhh
uuhhu
uuhh4
uuhh-
uuhuh
uuhuu
uuhu4
uuhu-
uuh4h
uuh4u
uuh44
uuh4-
uuh-h
uuh-u
uuh-4
uuh--
uuuhh
uuuhu
uuuh4
uuuh-
uuuuh
uuuuu
uuuu4
uuuu-
uuu4h
uuu4u
uuu44
uuu4-
uuu-h
uuu-u
uuu-4
uuu--
uu4hh
uu4hu
uu4h4
uu4h-
uu4uh
uu4uu
uu4u4
uu4u-
uu44h
uu44u
uu444
uu44-
uu4-h
uu4-u
uu4-4
uu4--
uu-hh
uu-hu
uu-h4
uu-h-
uu-uh
uu-uu
uu-u4
uu-u-
uu-4h
uu-4u
uu-44
uu-4-
uu--h
uu--u
uu--4
uu---
u4hhh
u4hhu
u4hh4
u4hh-
u4huh
u4huu
u4hu4
u4hu-
u4h4h
u4h4u
u4h44
u4h4-
u4h-h
u4h-u
u4h-4
u4h--
u4uhh
u4uhu
u4uh4
u4uh-
u4uuh
u4uuu
u4uu4
u4uu-
u4u4h
u4u4u
u4u44
u4u4-
u4u-h
u4u-u
u4u-4
u4u--
u44hh
u44hu
u44h4
u44h-
u44uh
u44uu
u44u4
u44u-
u444h
u444u
u4444
u444-
u44-h
u44-u
u44-4
u44--
u4-hh
u4-hu
u4-h4
u4-h-
u4-uh
u4-uu
u4-u4
u4-u-
u4-4h
u4-4u
u4-44
u4-4-
u4--h
u4--u
u4--4
u4---
u-hhh
u-hhu
u-hh4
u-hh-
u-huh
u-huu
u-hu4
u-hu-
u-h4h
u-h4u
u-h44
u-h4-
u-h-h
u-h-u
u-h-4
u-h--
u-uhh
u-uhu
u-uh4
u-uh-
u-uuh
u-uuu
u-uu4
u-uu-
u-u4h
u-u4u
u-u44
u-u4-
u-u-h
u-u-u
u-u-4
u-u--
u-4hh
u-4hu
u-4h4
u-4h-
u-4uh
u-4uu
u-4u4
u-4u-
u-44h
u-44u
u-444
u-44-
u-4-h
u-4-u
u-4-4
u-4--
u--hh
u--hu
u--h4
u--h-
u--uh
u--uu
u--u4
u--u-
u--4h
u--4u
u--44
u--4-
u---h
u---u
u---4
u----
4hhhh
4hhhu
4hhh4
4hhh-
4hhuh
4hhuu
4hhu4
4hhu-
4hh4h
4hh4u
4hh44
4hh4-
4hh-h
4hh-u
4hh-4
4hh--
4huhh
4huhu
4huh4
4huh-
4huuh
4huuu
4huu4
4huu-
4hu4h
4hu4u
4hu44
4hu4-
4hu-h
4hu-u
4hu-4
4hu--
4h4hh
4h4hu
4h4h4
4h4h-
4h4uh
4h4uu
4h4u4
4h4u-
4h44h
4h44u
4h444
4h44-
4h4-h
4h4-u
4h4-4
4h4--
4h-hh
4h-hu
4h-h4
4h-h-
4h-uh
4h-uu
4h-u4
4h-u-
4h-4h
4h-4u
4h-44
4h-4-
4h--h
4h--u
4h--4
4h---
4uhhh
4uhhu
4uhh4
4uhh-
4uhuh
4uhuu
4uhu4
4uhu-
4uh4h
4uh4u
4uh44
4uh4-
4uh-h
4uh-u
4uh-4
4uh--
4uuhh
4uuhu
4uuh4
4uuh-
4uuuh
4uuuu
4uuu4
4uuu-
4uu4h
4uu4u
4uu44
4uu4-
4uu-h
4uu-u
4uu-4
4uu--
4u4hh
4u4hu
4u4h4
4u4h-
4u4uh
4u4uu
4u4u4
4u4u-
4u44h
4u44u
4u444
4u44-
4u4-h
4u4-u
4u4-4
4u4--
4u-hh
4u-hu
4u-h4
4u-h-
4u-uh
4u-uu
4u-u4
4u-u-
4u-4h
4u-4u
4u-44
4u-4-
4u--h
4u--u
4u--4
4u---
44hhh
44hhu
44hh4
44hh-
44huh
44huu
44hu4
44hu-
44h4h
44h4u
44h44
44h4-
44h-h
44h-u
44h-4
44h--
44uhh
44uhu
44uh4
44uh-
44uuh
44uuu
44uu4
44uu-
44u4h
44u4u
44u44
44u4-
44u-h
44u-u
44u-4
44u--
444hh
444hu
444h4
444h-
444uh
444uu
444u4
444u-
4444h
4444u
44444
4444-
444-h
444-u
444-4
444--
44-hh
44-hu
44-h4
44-h-
44-uh
44-uu
44-u4
44-u-
44-4h
44-4u
44-44
44-4-
44--h
44--u
44--4
44---
4-hhh
4-hhu
4-hh4
4-hh-
4-huh
4-huu
4-hu4
4-hu-
4-h4h
4-h4u
4-h44
4-h4-
4-h-h
4-h-u
4-h-4
4-h--
4-uhh
4-uhu
4-uh4
4-uh-
4-uuh
4-uuu
4-uu4
4-uu-
4-u4h
4-u4u
4-u44
4-u4-
4-u-h
4-u-u
4-u-4
4-u--
4-4hh
4-4hu
4-4h4
4-4h-
4-4uh
4-4uu
4-4u4
4-4u-
4-44h
4-44u
4-444
4-44-
4-4-h
4-4-u
4-4-4
4-4--
4--hh
4--hu
4--h4
4--h-
4--uh
4--uu
4--u4
4--u-
4--4h
4--4u
4--44
4--4-
4---h
4---u
4---4
4----
-hhhh
-hhhu
-hhh4
-hhh-
-hhuh
-hhuu
-hhu4
-hhu-
-hh4h
-hh4u
-hh44
-hh4-
-hh-h
-hh-u
-hh-4
-hh--
-huhh
-huhu
-huh4
-huh-
-huuh
-huuu
-huu4
-huu-
-hu4h
-hu4u
-hu44
-hu4-
-hu-h
-hu-u
-hu-4
-hu--
-h4hh
-h4hu
-h4h4
-h4h-
-h4uh
-h4uu
-h4u4
-h4u-
-h44h
-h44u
-h444
-h44-
-h4-h
-h4-u
-h4-4
-h4--
-h-hh
-h-hu
-h-h4
-h-h-
-h-uh
-h-uu
-h-u4
-h-u-
-h-4h
-h-4u
-h-44
-h-4-
-h--h
-h--u
-h--4
-h---
-uhhh
-uhhu
-uhh4
-uhh-
-uhuh
-uhuu
-uhu4
-uhu-
-uh4h
-uh4u
-uh44
-uh4-
-uh-h
-uh-u
-uh-4
-uh--
-uuhh
-uuhu
-uuh4
-uuh-
-uuuh
-uuuu
-uuu4
-uuu-
-uu4h
-uu4u
-uu44
-uu4-
-uu-h
-uu-u
-uu-4
-uu--
-u4hh
-u4hu
-u4h4
-u4h-
-u4uh
-u4uu
-u4u4
-u4u-
-u44h
-u44u
-u444
-u44-
-u4-h
-u4-u
-u4-4
-u4--
-u-hh
-u-hu
-u-h4
-u-h-
-u-uh
-u-uu
-u-u4
-u-u-
-u-4h
-u-4u
-u-44
-u-4-
-u--h
-u--u
-u--4
-u---
-4hhh
-4hhu
-4hh4
-4hh-
-4huh
-4huu
-4hu4
-4hu-
-4h4h
-4h4u
-4h44
-4h4-
-4h-h
-4h-u
-4h-4
-4h--
-4uhh
-4uhu
-4uh4
-4uh-
-4uuh
-4uuu
-4uu4
-4uu-
-4u4h
-4u4u
-4u44
-4u4-
-4u-h
-4u-u
-4u-4
-4u--
-44hh
-44hu
-44h4
-44h-
-44uh
-44uu
-44u4
-44u-
-444h
-444u
-4444
-444-
-44-h
-44-u
-44-4
-44--
-4-hh
-4-hu
-4-h4
-4-h-
-4-uh
-4-uu
-4-u4
-4-u-
-4-4h
-4-4u
-4-44
-4-4-
-4--h
-4--u
-4--4
-4---
--hhh
--hhu
--hh4
--hh-
--huh
--huu
--hu4
--hu-
--h4h
--h4u
--h44
--h4-
--h-h
--h-u
--h-4
--h--
--uhh
--uhu
--uh4
--uh-
--uuh
--uuu
--uu4
--uu-
--u4h
--u4u
--u44
--u4-
--u-h
--u-u
--u-4
--u--
--4hh
--4hu
--4h4
--4h-
--4uh
--4uu
--4u4
--4u-
--44h
--44u
--444
--44-
--4-h
--4-u
--4-4
--4--
---hh
---hu
---h4
---h-
---uh
---uu
---u4
---u-
---4h
---4u
---44
---4-
----h
----u
----4
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