Automatically fetch sample test cases from codeforces.
cd $GOPATH
go get -u github.com/pin3da/cf-testcases
go install github.com/pin3da/cf-testcases
cf-testcase contest_id [problem_letter]
Example:
This will download all the sample test cases of Codeforces Beta Round #57 (Div. 2)
Note that 61 is the number in the URL of the contest.
cf-testcase 61
Download the cases for the problem D
cf-testcase 61 d