0_0_9552053_16778.cpp:25: error: size of array `vis' is too large
0_0_9552053_16778.cpp: In function `int bfs()':
0_0_9552053_16778.cpp:32: error: `vis' undeclared (first use this function)
0_0_9552053_16778.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
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