Competitive-Programming Game Theory/NIM and Grundy Numbers https://cp-algorithms.com/game_theory/sprague-grundy-nim.html https://youtu.be/h2ZsdmUkfMI https://codeforces.com/blog/entry/66040 Max Flow https://www.youtube.com/watch?v=Tl90tNtKvxs https://www.youtube.com/watch?v=w0-c8io12yY Segment Tree https://codeforces.com/blog/entry/15890 https://codeforces.com/blog/entry/18051 Binary Lifting https://www.youtube.com/watch?v=FAfSArGC8KY