View Compilation Error

0_0_7640744_26724.cpp:8: error: invalid function declaration
0_0_7640744_26724.cpp: In function `void dfs(int, int, int)':
0_0_7640744_26724.cpp:25: error: `dir' undeclared (first use this function)
0_0_7640744_26724.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)