算チャレver.3、第１５４問解答例アップ
一筆書きの経路数を求める問題です。経路は５本、分岐点は３個所なので、場合分けしながら数え上げても簡単ですね。
着眼点は２通り。１つは分岐点で次に進む方向を考える方法、もう１つは経路５本を並べ替える方法、いずれも条件を満たすように数えていくことがポイントです。
着眼点は２通り。１つは分岐点で次に進む方向を考える方法、もう１つは経路５本を並べ替える方法、いずれも条件を満たすように数えていくことがポイントです。
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