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## 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
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