The AC version of UVa#10154.
Support multiple test data
Fix czchen-10154
Add test case 10154-3 from ZSShen
Merge branch 'feature/test'

* feature/test:
  Add test case 10154-3 from ZSShen
  Fix czchen-10154
  Support multiple test data
Install python3 in travis-ci
AC code for UVa#10004.
Add test case for 104
Andy: AC code for UVa#10543.
Rename zsshen-10543.c to zsshen-10534.c
Rename 10543.in to 10534.in
Rename 10543.ans to 10534.ans
Implement czchen-10154
Fix typo
Don't calculate unnecessary items
Andy: AC code for UVa #10891.
Andy: Big test data for UVa #10891.
Andy: AC code for UVa#10404 and the corresponding test data.
AC UVa#599
Implement czchen-10165