goforces is go package for the codeforces(http://codeforces.com/) api. Check the Usage
go get github.com/togatoga/goforces
package main
import (
"context"
"fmt"
"github.com/togatoga/goforces"
)
func main() {
ctx := context.Background()
//logger
logger := log.New(os.Stderr, "*** ", log.LstdFlags)
//Codeforces client
api, _ := goforces.NewClient(logger)
//Problems
problems, _ := api.GetProblemSetProblems(ctx, &goforces.ProblemSetProblemsOptions{Tags: []string{"dp"}})
fmt.Printf("%+v\n", problems)
//Contest list
contestList, _ := api.GetContestList(ctx, nil)
fmt.Printf("%+v\n", contestList)
//If you use authorized methods, you must set your key and secret
api.SetAPIKey("<your key>")
api.SetAPISecret("<your secret>")
//User friends
friends, _ := api.GetUserFriends(ctx, nil)
fmt.Printf("%+v\n", friends)
}The official codeforces api documentation is here
Read Godoc