Package g3401_3500.s3474_lexicographically_smallest_generated_string

Class Solution

java.lang.Object
g3401_3500.s3474_lexicographically_smallest_generated_string.Solution
public class Solution extends Object
3474 - Lexicographically Smallest Generated String.

Hard

You are given two strings, str1 and str2, of lengths n and m, respectively.

A string word of length n + m - 1 is defined to be generated by str1 and str2 if it satisfies the following conditions for each index 0 <= i <= n - 1:

  • If str1[i] == 'T', the substring of word with size m starting at index i is equal to str2, i.e., word[i..(i + m - 1)] == str2.
  • If str1[i] == 'F', the substring of word with size m starting at index i is not equal to str2, i.e., word[i..(i + m - 1)] != str2.

Return the lexicographically smallest possible string that can be generated by str1 and str2. If no string can be generated, return an empty string "".

Example 1:

Input: str1 = “TFTF”, str2 = “ab”

Output: “ababa”

Explanation:

The table below represents the string "ababa"

IndexT/FSubstring of length m
0‘T’“ab”
1‘F’“ba”
2‘T’“ab”
3‘F’“ba”

The strings "ababa" and "ababb" can be generated by str1 and str2.

Return "ababa" since it is the lexicographically smaller string.

Example 2:

Input: str1 = “TFTF”, str2 = “abc”

Output: ""

Explanation:

No string that satisfies the conditions can be generated.

Example 3:

Input: str1 = “F”, str2 = “d”

Output: “a”

Constraints:

  • 1 <= n == str1.length <= 104
  • 1 <= m == str2.length <= 500
  • str1 consists only of 'T' or 'F'.
  • str2 consists only of lowercase English characters.

  • Constructor Details

    • Solution

      public Solution()

  • Method Details