add debug info
Revert "add debug info"

This reverts commit 39b1dc20c983c8b9af4a5ee693ff5e1cd24b9954.
Merge branch 'master' of https://github.com/xtaci/algorithms
adding btree delete
updating btree
updating btree delete
update btree, case 3
add comment for btree
check btree
adding comment
add comments
tmp save
debug btree
finish test with btree.
update btree demo & comments
update btree -- add procedure
update btree
change struct name nr -> Res
add comments for btree
update comment