View Compilation Error

0_0_7640690_16133.cpp:7: error: invalid function declaration
0_0_7640690_16133.cpp: In function `void dfs(int, int, int)':
0_0_7640690_16133.cpp:24: error: `dir' undeclared (first use this function)
0_0_7640690_16133.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)