new file: lists/ejudge/joseph.c
new file: lists/ejudge/joseph_full.c
new file: lists/ejudge/list3.c
new file: lists/ejudge/list3_full.c
new file: lists/list.c
new file: trees/tree1.c
new file: trees/tree2.c
new file: trees/tree2_full.c
new file: trees/tree4_full.c
