Merge branch 'master' into ElectronicStation
temp

Conflicts:
	ElectronicStation/restricted_sum_clearest.py
Merge branch 'master' into ElectronicStation

Conflicts:
	ElectronicStation/restricted_sum_clearest.py
On Electronic Station:
Find sequence problem solved. Also an good implementation of recursion is included for learning.
Merge pull request #13 from fqyx/ElectronicStation

Electronic station: find sequence