Weekly competitive programming and CCC practice articles.
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Use dynamic programming, local neighbor transitions, and rolling arrays to find the minimum-cost path through a repeating-cost grid.
Use BFS or DFS flood fill to harvest all reachable pumpkins and calculate their total value.
Simulate the snail step by step, track slimy squares with a visited set, and count every revisit.
Use interval coverage, a difference array, and prefix sums to answer illumination queries efficiently.