View Compilation Error

0_0_7812056_28839.cpp:4: error: invalid function declaration
0_0_7812056_28839.cpp: In function `void dfs(int, int, int, int)':
0_0_7812056_28839.cpp:25: error: `Dir' undeclared (first use this function)
0_0_7812056_28839.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)