0_0_6210007_14741.cpp: In function `int bfs(int, int, int, int, int, int, int)':
0_0_6210007_14741.cpp:31: error: `abs' undeclared (first use this function)
0_0_6210007_14741.cpp:31: error: (Each undeclared identifier is reported only once for each function it appears in.)
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