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oda
reviewed
Mar 14, 2026
| public: | ||
| int uniquePathsWithObstacles(vector<vector<int>>& obstacleGrid) { | ||
| if (obstacleGrid[0][0] == 1) { return 0; } | ||
| if (obstacleGrid.back().back() == 1) { return 0; } |
5ky7
reviewed
Mar 15, 2026
| return 0; | ||
| } | ||
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| step_count[0][0]=1; |
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| for (int y = 0; y < obstacleGrid.size(); ++y) { | ||
| for (int x = 0; x < obstacleGrid[0].size(); ++x) { |
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ただの好みですが，x,yよりrow, colあるいはi, jの方が自然な順番になって好きです．
mamo3gr
reviewed
Mar 19, 2026
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| if (i == 0 && j == 0) { | ||
| continue; | ||
| } |
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後半の処理と内容が重複しているので、消しても動きそうです。
Suggested change
| if (i == 0 && j == 0) { | |
| continue; | |
| } |
mamo3gr
reviewed
Mar 19, 2026
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| for (int y = 0; y < obstacleGrid.size(); ++y) { | ||
| for (int x = 0; x < obstacleGrid[0].size(); ++x) { |
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obstacleGrid.size() や obstacleGrid[0].size() を一度変数に置いたほうが、考えている座標系が伝わりやすいと思いました。個人的には row, col が分かりやすいです（y, x はそれぞれの次元との対応が必ずしも決まっているとは限らないので）。
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https://leetcode.com/problems/unique-paths-ii/description/