This opportunity I want to share with all this book that is great, I bought it a long time ago and I saw that they do not upload it for free in PDF here I leave the link and if you know of any good book about competitive programming let me know if.↵
Link in PDF:↵
[Programming Challenges LINK](https://www.mediafire.com/file/ckbhzo4k4tavbzd/desaf%EDos_de_programaci%F3n.pdf/file)↵
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Link in PDF:↵
[Programming Challenges LINK](https://www.mediafire.com/file/ckbhzo4k4tavbzd/desaf%EDos_de_programaci%F3n.pdf/file)↵
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