test.cmd

@echo off
:loop
gen.exe > input.txt
wa.exe < input.txt > wa_output.txt
correct.exe < input.txt > output.txt
fc output.txt wa_output.txt
if errorlevel 1 exit
goto loop

rem comments:
rem 1. switch commands output off
rem 2-8. infinite cycle. loop - name of the variable. May differ from loop
rem 3. generate test and write it to input.txt
rem 4-5. run wa solution and correct solution
rem on test saved in input.txt. The first program outputs result in wa_output.txt,
rem the second - in output.txt
rem 6. compare files output.txt and wa_output.txt (fc = file compare)
rem 7. check if files are different. If so, exit script
rem (so this test, on which wa solution works in a wrong way, will be saved in input.txt)