啊啊..怎么会这样, 再试...

//filename1.txt
test1a.txt test1b.txt
out1.txt

//filename2.txt
test2a.txt test2b.txt
out2.txt

//filename3.txt
test3a.txt test3b.txt
out3.txt


//script
g++ test.cpp
./a.out g++ test.cpp
./a.out g++ test.cpp
./a.out