View Compilation Error

0_0_7641185_1892.cpp:10: error: invalid function declaration
0_0_7641185_1892.cpp: In function `void dfs(int, int)':
0_0_7641185_1892.cpp:27: error: `di' undeclared (first use this function)
0_0_7641185_1892.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)