g++ apple_bl.cpp -o apple_bl
g++ apple.cpp -o apple
g++ make.cpp -o make

# 编译生成可执行程序

while true 
do
    ./make > 1.in
    ./apple_bl < 1.in > right.out
    ./apple < 1.in > wrong.out

    # 生成数据并且产生输出

    diff -Z right.out wrong.out
    if [ $? -ne 0 ]; then
        echo "" # 换行用
        cat 1.in
        echo ""
        break
    fi

    # 比较，不同则输出产生不同的输入输出
done