2023 February Contest · Full set
All twelve problems from the USACO 2023 February round, organised by division. Each division page contains my write-up of the three problems: paraphrased statement, key idea, C++ reference solution, and pitfalls.
Contest metadata
| Field | Value |
|---|---|
| Season · Round | 2022–2023 · February |
| Divisions | Bronze, Silver, Gold, Platinum |
| Problems per division | 3 |
| Window | Friday Feb 24 – Monday Feb 27, 2023 (4 hours per attempt) |
| Languages | C, C++17/20, Java, Python 3 (defaults) |
| Default time / memory | 2.0 s / 256 MB (Silver problems 2–3 and Gold/Platinum extend these — noted per problem) |
Browse by division
Bronze · 3 problems
Hungry Cow · Stamp Grid · Watching Mooloo. Simulation-with-compression, brute-force grid stamping, and a tiny greedy/DP on intervals.
Silver · 3 problems
Bakery · Cow-libi · Moo Route II. Binary-search-the-answer, sort-and-sweep alibi check, and earliest-arrival BFS on a time-travel graph.
Gold · 3 problems
Equal Sum Subarrays · Fertilizing Pastures · Piling Papers. O(N²·logN) subarray-sum pairing, tree DFS with edge doubling, and an interval DP on digit stacks.
Platinum · 3 problems
Hungry Cow · Problem Setting · Watching Cowflix. Segtree-with-lazy "eat days," subset-DP over solver patterns, and Aliens-trick on a tree.
How I'm reading this set
- Bronze first, cold. 60-minute timer, no editorial, no AI.
- Silver next, cold. Same drill — silver is the level I'm targeting.
- Gold for exposure. Read statements, predict algorithm family, then editorial.
- Platinum for the long view. Read editorials, attempt one of the three.