63. Unique Paths II #37
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added 2 commits
June 9, 2025 01:20
oda
reviewed
Jun 9, 2025
| * ガイドをみてもループないならOKそう | ||
| * 入力配列のバリデーションもやはり意識すべし | ||
| * エッジ初期化を先にする手法。コード量は増えるがやってることは少し、明示的な気もするなくらいな気持ち。 | ||
| * |
hroc135
reviewed
Jun 18, 2025
| numOfPaths[r][c] = 0; | ||
| continue; | ||
| } | ||
| if (r != 0) { |
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ループが r=1 から始まっているので不要だと思います。
反対に、この条件を入れるならr, cが0の場合を処理しているループを二重ループの方に統合できますね。r, cが両方0の場合の処理も入れる必要がありますが
| if (numOfCol == 0) { | ||
| return 0; | ||
| } | ||
| if (obstacleGrid[0][0] == OBSTACLE || obstacleGrid[numOfRow - 1][numOfCol - 1] == OBSTACLE) { |
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自分も無駄な計算が生じないようにこうやって弾きたくなります。
01
11
から始まるような場合もグリッドが大きいと最適化したくなるかもしれませんね。
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問題URL:https://leetcode.com/problems/unique-paths-ii/description/