686. Repeated String Match LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Repeated String Match Given two strings a and b, return the minimum number of times you should repeat string a so that string b is a substring of it. If it is impossible for b​​​​​​ to be a substring of a after repeating it, return -1.

Notice: string "abc" repeated 0 times is "", repeated 1 time is "abc" and repeated 2 times is "abcabc".

Example 1:

Input: a = "abcd", b = "cdabcdab"
Output: 3
Explanation: We return 3 because by repeating a three times "abcdabcdabcd", b is a substring of it.

Example 2:

Input: a = "a", b = "aa"
Output: 2


  • 1 <= a.length, b.length <= 104
  • a and b consist of lowercase English letters.

Repeated String Match Solutions

Time: O(n)
Space: O(n)


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