uva live 5915 flight

[test_tset]

I think test cases for this problem is too weak,I write a weak solution,and got accepted ,but when I randomly test some official
test cases, my solution is wrong.... Hope admin can get test cases stronger

[test_tset]

Hope admin can add all offical tests,I got this problem accepted on codeforces gym, the test cases are stronger,but I don't think
6s for each test case is good,because O(n*m) brute force algorithm can run to test case 28....(32 cases in total) I want to test some other solution if it is strong enough