Fix BUG in graph reverse method & Add needed tests#916
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Would you please check this PR? @trekhleb |
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This PR fix the issue in #873.
The issue was in the old reverse method, edges reversed one by one and this was making issue for graphs with cycle of length 2. For example, when graph with only two edges AB and BA was reversing, on reversing AB, BA was exist and there will be crash.