first commit haha
Revert "median"

This reverts commit e1ca99e62a0dd0c5ef0714ca6b7494439c81b0d8.
Revert "Revert "median""

This reverts commit 7aca8c88fc0daa95000245e52a2888fcbd4eaf85.
Merge branch 'master' of github.com:xblwyc/leetcode