942. DI String Match LeetCode Solution | Easy Approach

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DI String Match A permutation perm of n + 1 integers of all the integers in the range [0, n] can be represented as a string s of length n where:

  • s[i] == 'I' if perm[i] < perm[i + 1], and
  • s[i] == 'D' if perm[i] > perm[i + 1].

Given a string s, reconstruct the permutation perm and return it. If there are multiple valid permutations perm, return any of them.

Example 1:

Input: s = "IDID"
Output: [0,4,1,3,2]

Example 2:

Input: s = "III"
Output: [0,1,2,3]

Example 3:

Input: s = "DDI"
Output: [3,2,0,1]

Constraints:

  • 1 <= s.length <= 105
  • s[i] is either 'I' or 'D'.

DI String Match Solutions

Time: O(n)
Space: O(n)

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