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g0001_0100.s0060_permutation_sequence.readme.md Maven / Gradle / Ivy

60\. Permutation Sequence

Hard

The set `[1, 2, 3, ..., n]` contains a total of `n!` unique permutations.

By listing and labeling all of the permutations in order, we get the following sequence for `n = 3`:

1.  `"123"`
2.  `"132"`
3.  `"213"`
4.  `"231"`
5.  `"312"`
6.  `"321"`

Given `n` and `k`, return the kth permutation sequence.

**Example 1:**

**Input:** n = 3, k = 3

**Output:** "213"

**Example 2:**

**Input:** n = 4, k = 9

**Output:** "2314"

**Example 3:**

**Input:** n = 3, k = 1

**Output:** "123"

**Constraints:**

*   `1 <= n <= 9`
*   `1 <= k <= n!`