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Formatted question description: https://leetcode.ca/all/1844.html
1844. Replace All Digits with Characters
Level
Easy
Description
You are given a 0-indexed string s
that has lowercase English letters in its even indices and digits in its odd indices.
There is a function shift(c, x)
, where c
is a character and x
is a digit, that returns the x-th
character after c
.
- For example,
shift('a', 5) = 'f'
andshift('x', 0) = 'x'
.
For every odd index i
, you want to replace the digit s[i]
with shift(s[i-1], s[i])
.
Return s
after replacing all digits. It is guaranteed that shift(s[i-1], s[i])
will never exceed 'z'
.
Example 1:
Input: s = “a1c1e1”
Output: “abcdef”
Explanation: The digits are replaced as follows:
- s[1] -> shift(‘a’,1) = ‘b’
- s[3] -> shift(‘c’,1) = ‘d’
- s[5] -> shift(‘e’,1) = ‘f’
Example 2:
Input: s = “a1b2c3d4e”
Output: “abbdcfdhe”
Explanation: The digits are replaced as follows:
- s[1] -> shift(‘a’,1) = ‘b’
- s[3] -> shift(‘b’,2) = ‘d’
- s[5] -> shift(‘c’,3) = ‘f’
- s[7] -> shift(‘d’,4) = ‘h’
Constraints:
1 <= s.length <= 100
s
consists only of lowercase English letters and digits.shift(s[i-1], s[i]) <= 'z'
for all odd indicesi
.
Solution
Loop over odd indices of s
and convert the characters to the shifted characters. Then return the modified string.
-
class Solution { public String replaceDigits(String s) { char[] array = s.toCharArray(); int length = array.length; for (int i = 1; i < length; i += 2) { char letter = array[i - 1]; int digit = array[i] - '0'; array[i] = (char) (letter + digit); } return new String(array); } }
-
// OJ: https://leetcode.com/problems/replace-all-digits-with-characters/ // Time: O(N) // Space: O(1) class Solution { public: string replaceDigits(string s) { for (int i = 1; i < s.size(); i += 2) { s[i] = s[i-1] + (s[i] - '0'); } return s; } };
-
class Solution: def replaceDigits(self, s: str) -> str: s = list(s) for i in range(1, len(s), 2): s[i] = chr(ord(s[i - 1]) + int(s[i])) return ''.join(s) ############ # 1844. Replace All Digits with Characters # https://leetcode.com/problems/replace-all-digits-with-characters/ class Solution: def replaceDigits(self, s: str) -> str: res = [] for i, c in enumerate(s): if c.isnumeric(): res.append(chr(ord(s[i-1]) + int(c))) else: res.append(c) return "".join(res)