View Compilation Error

0_0_1746843_21693.cpp: In function `int DFS(int, int)':
0_0_1746843_21693.cpp:14: error: `visit' undeclared (first use this function)
0_0_1746843_21693.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1746843_21693.cpp: In function `int main()':
0_0_1746843_21693.cpp:41: error: `visit' undeclared (first use this function)