View Compilation Error

237138_0_16754.cpp: In function `int dfs(int)':
237138_0_16754.cpp:17: error: `search' undeclared (first use this function)
237138_0_16754.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
237138_0_16754.cpp: In function `void out()':
237138_0_16754.cpp:39: error: `search' undeclared (first use this function)