View Compilation Error

0_0_4376981_17490.cpp: In function `void dfs(int, int)':
0_0_4376981_17490.cpp:15: error: `find' undeclared (first use this function)
0_0_4376981_17490.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4376981_17490.cpp: In function `int main()':
0_0_4376981_17490.cpp:52: error: `find' undeclared (first use this function)