Solution of the task: IMO Shortlist 2005 problem C4
Solutions
#Time ↓TaskUserSolutionCorrectness
205695 months, 2 weeksIMO Shortlist 2005 problem C411235 empty  
115226 years, 2 monthsIMO Shortlist 2005 problem C4PETARMAT empty  
70487 years, 9 monthsIMO Shortlist 2005 problem C4abeker empty