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g0301_0400.s0394_decode_string.readme.md Maven / Gradle / Ivy

394\. Decode String

Medium

Given an encoded string, return its decoded string.

The encoding rule is: `k[encoded_string]`, where the `encoded_string` inside the square brackets is being repeated exactly `k` times. Note that `k` is guaranteed to be a positive integer.

You may assume that the input string is always valid; there are no extra white spaces, square brackets are well-formed, etc. Furthermore, you may assume that the original data does not contain any digits and that digits are only for those repeat numbers, `k`. For example, there will not be input like `3a` or `2[4]`.

The test cases are generated so that the length of the output will never exceed 105.

**Example 1:**

**Input:** s = "3[a]2[bc]"

**Output:** "aaabcbc"

**Example 2:**

**Input:** s = "3[a2[c]]"

**Output:** "accaccacc"

**Example 3:**

**Input:** s = "2[abc]3[cd]ef"

**Output:** "abcabccdcdcdef"

**Constraints:**

*   `1 <= s.length <= 30`
*   `s` consists of lowercase English letters, digits, and square brackets `'[]'`.
*   `s` is guaranteed to be **a valid** input.
*   All the integers in `s` are in the range `[1, 300]`.