town Batch , stdin/stdout

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NOTE: Testcases are faulty. There ARE self-loops AND multiple edges with the same end points, so please consider those cases in your implementation.

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Subtask	Score	#TC	Time	Memory	Scoring
1	100	11	1s	32MB	Average
2	0	1	1s	32MB	Minimum

g++-7 ans.cpp -o town -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512