View Compilation Error

0_0_2199649_4764.cpp: In function `void dfs(int, int, int)':
0_0_2199649_4764.cpp:16: error: `num' undeclared (first use this function)
0_0_2199649_4764.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2199649_4764.cpp:17: error: `tem' undeclared (first use this function)