213. House Robber II#34
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liquo-rice
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Apr 23, 2026
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| ### step3 | ||
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| 3回通すまで書き直し。 |
nodchip
reviewed
Apr 23, 2026
| public: | ||
| int rob(vector<int>& nums) { | ||
| int size = nums.size(); | ||
| vector<vector<int>> sum(size, vector<int>(2)); |
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first～last までの範囲で盗めるお金を最大化する関数を実装し、 0～nums.size()-2 と 1～nums.size()-1 の範囲で、それぞれ盗めるお金の最大値を算出し、 max() を取る実装のほうがシンプルになると思います。
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ありがとうございます。alternative-solution.cppで実装して追加してみました。
5ky7
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Apr 23, 2026
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| if (i == 0) { | ||
| sum[i][0] = 0; | ||
| sum[i][1] = nums[i]; |
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forループの外に出して，forをi = 1から始める方が見やすいと感じました．
sum[0][0] = 0;
sum[0][0] = nums[0];
for (int i = 1; i < size; ++i) {
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たしかにこれはfor文の外に出してしまったほうがよさそうですね。ありがとうございます。
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この問題：https://leetcode.com/problems/house-robber-ii/description/
次に解く問題：https://leetcode.com/problems/best-time-to-buy-and-sell-stock/description/