I recently switched to Emacs but I can't find any good configurations build for competitive programming.So far I have mapped key to execute cpp programs with input.txt as STDIN .
(defun execute-c-program ()
(interactive)
(defvar foo)
(setq foo (concat "g++ " (buffer-name) " && ./a.out" ))
(shell-command foo))
(define-key c++-mode-map [f5] #'execute-c-program)
If anyone has better config for compile ,execute that eliminates infinite looping problem and snippets or any useful packages then please share configs.
You could potentially try Spacemacs, which is a combination of emacs and vim. I find it to be very convenient combining it with terminal and using makefile to compile programs.