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View Compilation Error

0_0_5023725_30673.cpp: In function `int BFS()':
0_0_5023725_30673.cpp:63: error: `x' undeclared (first use this function)
0_0_5023725_30673.cpp:63: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5023725_30673.cpp:63: error: `y' undeclared (first use this function)


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