- Difficulty: Easy
- Tags: LeetCode, Easy, Greedy, Array, Two Pointers, String, leetcode-942, O(n), O(1)
Problem
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'
ifperm[i] < perm[i + 1]
, ands[i] == 'D'
ifperm[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'
.