0_0_7640747_6497.cpp:8: error: invalid function declaration
0_0_7640747_6497.cpp: In function `void dfs(int, int, int)':
0_0_7640747_6497.cpp:25: error: `dir' undeclared (first use this function)
0_0_7640747_6497.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
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