View Compilation Error

0_0_11529392_17622.cpp:8: error: `maxn' was not declared in this scope
0_0_11529392_17622.cpp: In function `int dfs(int, LL, int, int, int)':
0_0_11529392_17622.cpp:16: error: `Hash' undeclared (first use this function)
0_0_11529392_17622.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11529392_17622.cpp: In function `int main()':
0_0_11529392_17622.cpp:36: error: `Hash' undeclared (first use this function)