## Sept 21 - Sept 27

- *1295 E. Permutation Separation (2200) - stupid

- *1252 E. Songwriter (2200) - like Leetcode, keep upper/lower bounds

- 1252 K. Addition Robot (2100) - matrix class

- *1223 E. Paint the Tree (2100) - Read problem carefully

- 1288 E. Messenger Simulator (2000) - ordered set

- *1280 C. Jeremy Bearimy (2000) - greedy observation, look at each edge

- 1249 F. Maximum Weight Subset (2200) - max_element makes code harder to read/debug

- 1267 K. Key Storage (2100) - math, wrote generator to debug

- 1234 E. Special Permutations (2000) - easy to implement with segment tree / prefix sums

- 1250 N. Wires (2000) - hard implementation, find bridges in graph

- 1223 D. Sequence Sorting (2000) - idea a bit complicated, write test cases to debug