Shor's SG Collection - 4 Star (0/600)

Shor the Duck's SG Collection, a curated problemset split into difficulties of the best problems on Codebreaker set by the SG IO Community! Criteria for 4 star: Requires slightly more advanced techniques/data-structures, and may require some more thinking than 3 star. (BSTA, Non-linear DS, more advanced application of prefix sums, basic DP, basic applications of DFS/BFS/Dijkstra) Should be challenging for Codeforces pupils, and suitable for Codeforces Specialists. Around NOI 2024 q1 (problemsetter) level