Package g0301_0400.s0394_decode_string

Class Solution

java.lang.Object
g0301_0400.s0394_decode_string.Solution
public class Solution extends java.lang.Object
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; 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 won’t be input like 3a or 2[4].

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”

Example 4:

Input: s = “abc3[cd]xyz”

Output: “abccdcdcdxyz”

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].

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    decodeString(java.lang.String s)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • decodeString

      public java.lang.String decodeString(java.lang.String s)