PUMaC 2007 · 组合（A 组） · 第 10 题

PUMaC 2007 — Combinatorics (Division A) — Problem 10

Pawns are arranged on an 8 × 8 chessboard such that • Each 2 × 1 or 1 × 2 rectangle has at least 1 pawn • Each 7 × 1 or 1 × 7 rectangle has at least 1 pair of adjacent pawns What is the minimum number of pawns in such an arrangement? 1

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