If you have a problem - WA4 - consider sorting input, not output

for example:

5
1 5
3 6
1 3
9 6
4 2

answer
3
1 3
3 6
6 9

I pass the test,But I still got WA#4

thanks for helping me solve WA 1



Edited by author 19.11.2013 20:56