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جای یک و منفی یک را عوض کنید

از shaazzz
پرش به ناوبری پرش به جستجو

یه جدوله n*n داریم که توش عدد هایه 1 و -1 و 0 رو نوشتیم. به طوری که تویه هر سطری دقیقن یدونه 1 هست و یدونه -1. هر باری میتونی 2 تا سطر یا 2 تا ستون جدول رو بگیری و جایه اون 2 تا رو با هم عوض کنی .ثابت کنین میتونیم به جدولی برسیم که جایه 1 ها و -1 ها نسبت به جدوله قبلی توش عوض شده.