I'm wondering if I should buy the book, but I don't know if it will be worth it. Any opinions? I'm still in high school.
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depend on what you want to do. if you want to prepare for IOI and other similar contest, yes you should buy one. If you just do the contest to improve knowledge, no need to buy.
In some areas you can never buy from store/online. so use download version
One does not simply get a medal by reading one book