algorithms/algorithms/strings/repeat_string.py at master · redoules/algorithms · GitHub

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"""
Given two strings A and B, find the minimum number of times A has to be repeated such that B is a substring of it. If no such solution, return -1.

For example, with A = "abcd" and B = "cdabcdab".

Return 3, because by repeating A three times (“abcdabcdabcd”), B is a substring of it; and B is not a substring of A repeated two times ("abcdabcd").

Note:
The length of A and B will be between 1 and 10000.

Reference: https://leetcode.com/problems/repeated-string-match/description/
"""
def repeat_string(A, B):
    count = 1
    tmp = A
    max_count = (len(B) / len(A)) + 1
    while not(B in tmp):
        tmp = tmp + A
        if (count > max_count):
            count = -1
            break
        count = count + 1

    return count