View Compilation Error

192544_0_10425.cpp: In function `void dfs(int, int, int)':
192544_0_10425.cpp:16: error: `find' undeclared (first use this function)
192544_0_10425.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
192544_0_10425.cpp: In function `int main()':
192544_0_10425.cpp:52: error: `find' undeclared (first use this function)