4
0 0
0 0
1 2
1 2

we should output 24, but the test answer is 0024.so..

Hello,

Your test is incorrect. The correct test is:
4
0 0
0 0
1 1
2 2

And the correct answer is 0024, cuz answer should have the same length as the input.

Best Regards

Edited by author 17.01.2012 02:15