Solution of the task: IMO Shortlist 2005 problem N7
Solutions
#Time ↓TaskUserSolutionCorrectness
141745 years, 3 monthsIMO Shortlist 2005 problem N7PETARMAT to do  
141075 years, 3 monthsIMO Shortlist 2005 problem N7marin049 empty  
114255 years, 3 monthsIMO Shortlist 2005 problem N7abeker empty