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huyfififi
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Jan 30, 2026
| /* | ||
| n = nums.len() | ||
| 時間計算量: O(n!) | ||
| 空間計算量: O(n!) |
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最終的に長さ n のpermutationを n! 個保持する必要があるため、空間計算量は O(n * n!) だと思います (が、自信はありません😓)
| } | ||
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| for i in swap_index..nums_len { | ||
| permutation.swap(swap_index, i); |
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前の方は確定済み、後ろの方は未確定という状態なので、permutationの代わりにprefix_and_remainingなどとするのも一つの案かもしれません。
nodchip
reviewed
Jan 31, 2026
| fn make_permutations( | ||
| mut nums: VecDeque<i32>, | ||
| permutation: Vec<i32>, | ||
| permutatioins: &mut Vec<Vec<i32>>, |
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問題: 46. Permutations
次に解く問題: 78. Subsets
ファイルの構成:
./src/bin/<各ステップ>.rs