PUMaC 2007 · 组合（B 组） · 第 3 题
PUMaC 2007 — Combinatorics (Division B) — Problem 3
题目详情
- An 80x80 grid is colored orange and black. A square is black if and only if either the square below it or the square to the left of it is black, but not both (If there is no such square, consider it as if it were orange). The only exception is the bottom left square, which is black. Consider the diagonal from the upper left to the lower right. How many black squares does this diagonal have? 3
解析
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Original Explanation
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