View Compilation Error

0_0_18157635_31444.cpp: In member function 'void S::init(int)':
0_0_18157635_31444.cpp:57:39: error: return-statement with a value, in function returning 'void' [-fpermissive]
         if (p - key == 400000) return 0; 
                                       ^
0_0_18157635_31444.cpp: In function 'void add(int, char*)':
0_0_18157635_31444.cpp:91:29: error: return-statement with a value, in function returning 'void' [-fpermissive]
   if (cnt == 100000) return 0;
                             ^