LeetCode 1528. Shuffle String

Description

https://leetcode.com/problems/shuffle-string/

Given a string s and an integer array indices of the same length.

The string s will be shuffled such that the character at the ith position moves to indices[i] in the shuffled string.

Return the shuffled string.

Example 1:

Input: s = "codeleet", indices = [4,5,6,7,0,2,1,3]
Output: "leetcode"
Explanation: As shown, "codeleet" becomes "leetcode" after shuffling.

Example 2:

Input: s = "abc", indices = [0,1,2]
Output: "abc"
Explanation: After shuffling, each character remains in its position.

Example 3:

Input: s = "aiohn", indices = [3,1,4,2,0]
Output: "nihao"

Example 4:

Input: s = "aaiougrt", indices = [4,0,2,6,7,3,1,5]
Output: "arigatou"

Example 5:

Input: s = "art", indices = [1,0,2]
Output: "rat"

Constraints:

  • s.length == indices.length == n
  • 1 <= n <= 100
  • s contains only lower-case English letters.
  • 0 <= indices[i] < n
  • All values of indices are unique (i.e. indices is a permutation of the integers from 0 to n - 1).

Explanation

Build a new string base the character orders.

Python Solution

class Solution:
    def restoreString(self, s: str, indices: List[int]) -> str:
        result = ""
        
        orders = {}
        for i, index in enumerate(indices):
            orders[index] = s[i]

        for i in range(len(indices)):
            result += orders[i]
            
            
        return result
  • Time Complexity: O(N)
  • Space Complexity: O(N)

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