Clone this repository and run npm i -g . at the root folder.
cf-crawler samples --platform=cf --id=1516
or simply
cf-crawler -p=cf -i=1516
This creates one folder for each problem, each containing your template CPP code and the sample files.
You first need to start the submission server.
cf-crawler server --platform=cf
or
cf-crawler server -p=cf
It will ask for your username and password. Once it successfully logs in, you need keep the process running as it is running a server that will submit your solutions to the selected platform.
To submit a solution, run
cf-crawler submit --platform=cf --id=1516 --problem=A solution.cpp
or
cf-crawler submit -p=cf -i=1516 -P=A solution.cpp
If you used the samples command, the Makefile in each problem's folder has a command to submit your code, so you can simply do make submit.
So far the only implemented platform is Codeforces. I have plans of implementing this for Google competitions as well (Kickstart / GCJ), but I'm too lazy at the moment.