View Compilation Error

0_0_8953727_3005.cpp: In function `void dfs(int, int, node*)':
0_0_8953727_3005.cpp:56: error: `find' undeclared (first use this function)
0_0_8953727_3005.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8953727_3005.cpp: In function `int main()':
0_0_8953727_3005.cpp:97: error: `find' undeclared (first use this function)