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# [815. Bus Routes](https://leetcode.com/problems/bus-routes/)
## 题目:
## 题目
We have a list of bus routes. Each `routes[i]` is a bus route that the i-th bus repeats forever. For example if `routes[0] = [1, 5, 7]`, this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... forever.