0_0_8968622_27845.cpp: In function `int bfs(int, int, int, int)':
0_0_8968622_27845.cpp:34: error: `visit' undeclared (first use this function)
0_0_8968622_27845.cpp:34: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8968622_27845.cpp: In function `int main()':
0_0_8968622_27845.cpp:75: error: `visit' undeclared (first use this function)
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