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From 1998 to 2000, I have participated in a few programming contests, such as the yearly ACM International Collegiate Programming Contest and CUPCAM.
Many of the problems proposed for such contests have been recopilated by the University of Valladolid; Ciriaco García de Celis created an Online Judge where everybody could be able to submit solutions, and the system tells them if they are correct or not.
As of today, there are 2694 problems, and I have solved 90 of them. And today I am publishing my solutions here.