1208. Get Equal Substrings Within Budget

[mah-shamim]

You are given two strings s and t of the same length and an integer maxCost.

You want to change s to t. Changing the ith character of s to ith character of t costs |s[i] - t[i]| (i.e., the absolute difference between the ASCII values of the characters).

Return the maximum length of a substring of s that can be changed to be the same as the corresponding substring of t with a cost less than or equal to maxCost. If there is no substring from s that can be changed to its corresponding substring from t, return 0.

Example 1:

• Input: s = "abcd", t = "bcdf", maxCost = 3
• Output: 3
• Explanation: "abc" of s can change to "bcd".
  That costs 3, so the maximum length is 3.

Example 2:

• Input: s = "abcd", t = "cdef", maxCost = 3
• Output: 1
• Explanation: Each character in s costs 2 to change to character in t, so the maximum length is 1.

Example 3:

• Input: s = "abcd", t = "acde", maxCost = 0
• Output: 1
• Explanation: You cannot make any change, so the maximum length is 1.

Constraints:

• 1 <= s.length <= 105
• t.length == s.length
• 0 <= maxCost <= 106
• s and t consist of only lowercase English letters.