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| 1 | +#================================================== |
| 2 | +#==> Title: 859. 亲密字符串 |
| 3 | +#==> Author: Zhang zhen |
| 4 | +#==> Email: hustmatnoble.gmail.com |
| 5 | +#==> GitHub: https://github.com/MatNoble |
| 6 | +#==> Date: 2/1/2021 |
| 7 | +#================================================== |
| 8 | + |
| 9 | +""" |
| 10 | +https://leetcode-cn.com/problems/buddy-strings/ |
| 11 | +""" |
| 12 | + |
| 13 | +class Solution: |
| 14 | + def buddyStrings(self, A: str, B: str) -> bool: |
| 15 | + n, m = len(A), len(B) |
| 16 | + if n != m: return False |
| 17 | + if A == B: |
| 18 | + C = set() |
| 19 | + for a in A: |
| 20 | + if a in C: return True |
| 21 | + C.add(a) |
| 22 | + return False |
| 23 | + else: |
| 24 | + C = [] |
| 25 | + for i in range(n): |
| 26 | + if A[i] != B[i]: |
| 27 | + C.append([A[i], B[i]]) |
| 28 | + if len(C) >=3: return False |
| 29 | + return len(C) == 2 and C[0] == C[-1][::-1] |
| 30 | + |
| 31 | +mat = Solution() |
| 32 | +A = 'acb' |
| 33 | +B = 'abc' |
| 34 | +A = 'aa' |
| 35 | +B = 'aa' |
| 36 | +mat.buddyStrings(A, B) |
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