== include(page="template/taskheader" task_id="ucl") ==

Poveste şi cerinţă...
 
h2. Date de intrare
 

Stefan is a big football fan and he's also interested in various statistics related to his favorite sport. Today he read about some past football competitions which involved group stage events and he's now stuck with trying to solve this problem:
Given the final results of a round robin round (each team plays against each team twice), help Stefan find whether there is a unique way of assigning the results for each match such that we end up having the final standings given in the input. Since the data can be faulty, there can also be a chance of having invalid group stages, so you will also have to help Stefan find them out.

Since Stefan is ambitious, he wants you to find the results for $t$ such final tables.

h2. Date de intrare
 

h2. Date de ieşire
În fişierul de ieşire $ucl.out$ ...