View Compilation Error

732313_0_0_8759.cpp: In function `void dfs(int*, int, int)':
732313_0_0_8759.cpp:28: error: `find' undeclared (first use this function)
732313_0_0_8759.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)
732313_0_0_8759.cpp: In function `int max_clique()':
732313_0_0_8759.cpp:65: error: `find' undeclared (first use this function)