View Compilation Error

0_0_18882090_1268.cpp: In function 'void dfs(int)':
0_0_18882090_1268.cpp:14:10: error: return-statement with a value, in function returning 'void' [-fpermissive]
   return n;
          ^
0_0_18882090_1268.cpp: In function 'int main()':
0_0_18882090_1268.cpp:44:27: error: 'menset' was not declared in this scope
   menset(map,0,sizeof(map));
                           ^