judge.sh

#!/bin/bash
# Judge script
# For personal use only, not to be used on a real judge system
# Execution: put the executable in the same folder with the inputs as .in files and expected outputs as .ans

for input in *.in; do
    for ((i=0; i<=3; i++)); do
        ./a.out < "$input" > "temp"
	filename=$(basename ${input%.*}.ans)
	result=$(diff -w "$filename" "temp")
	if [ $? -eq 0 ]
	then
        	echo "OK"
	else
        	echo "diff" $result $filename
	fi
	rm "temp"
    done
done