276. Paint Fence#24
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Shunii85
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May 3, 2026
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| tmp = num_ways_prev_1 | ||
| num_ways_prev_1 = (k - 1) * (num_ways_prev_1 + num_ways_prev_2) | ||
| num_ways_prev_2 = tmp |
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tmpは意味がなくて読みにくいので、num_ways_hereで、今のポストまでのパターンを計算しておいて、num_ways_prev2に1を代入、1にhereを代入する、と書くとわかりやすいと思いました。
h-masder
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May 5, 2026
| return k | ||
| if n == 2: | ||
| return k * k | ||
| num_ways_prev_2 = k |
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もう少し、変数の意図が明確になるといいなと思います
num_ways_up_to_two_posts_before などはいかがでしょうか
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たしかにnum_ways_prev_2ややわかりづらいかもしれません。
num_ways_up_to_two_posts_before の方がより明確だと思います。
h-masder
reviewed
May 5, 2026
| 1. $post_{n}$を$post_{n-1}$と違う色にする | ||
| - 色の選択肢は$k-1$ | ||
| 2. $post_{n}$と$post_{n-1}$を同じにする | ||
| - 色の選択肢は$k-1$ |
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ここは、「$post_{n}$と$post_{n-1}$を同じに塗れる数は、$post_{n-2}$と違う色になっている$post_(n-1)$の数である、ということかと思いましたが，あっていますでしょうか。
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コメントありがとうございます。その理解で合っています。
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