View Compilation Error

0_0_7792825_12153.cpp: In function `void dfs(int, int, node*)':
0_0_7792825_12153.cpp:52: error: `find' undeclared (first use this function)
0_0_7792825_12153.cpp:52: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7792825_12153.cpp: In function `int main()':
0_0_7792825_12153.cpp:92: error: `find' undeclared (first use this function)