Solution of the task: IMO Shortlist 2005 problem N7
Solutions
#Time ↓TaskUserSolutionCorrectness
141748 years, 1 monthIMO Shortlist 2005 problem N7PETARMAT to do  
141078 years, 2 monthsIMO Shortlist 2005 problem N7marin049 empty  
114258 years, 2 monthsIMO Shortlist 2005 problem N7abeker empty