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1844. Replace All Digits with Characters 👍

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  string replaceDigits(string s) {
    for (int i = 0; i < s.length(); ++i)
      s[i] += s[i - 1] - '0';
    return s;
  }
};

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class Solution {
  public String replaceDigits(String s) {
    char[] A = s.toCharArray();

    for (int i = 1; i < A.length; i += 2)
      A[i] += (char) (A[i - 1] - '0');

    return String.valueOf(A);
  }
}

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class Solution:
  def replaceDigits(self, s: str) -> str:
    A = list(s)

    for i in range(1, len(A), 2):
      A[i] = chr(ord(A[i - 1]) + ord(A[i]) - ord('0'))

    return ''.join(A)