IMO problems Many thanks to all those who supplied solutions where I failed, or pointed out errors, or supplied better solutions. All suggestions for improvement would be most welcome. It would also be good to supply hints which just gave the key idea.
Any contributions welcome.
Thru 2000 there were 41 IMOs, each with 6 problems, except for 1962 which had 7, giving a total 247 problems in all. I have numbered them randomly from 1 to 247. This has the advantage of no links to the solutions, for those who want to make it difficult for themselves to cheat.