View Compilation Error

0_0_18119103_21014.cpp: In function 'void bfs()':
0_0_18119103_21014.cpp:40:33: error: return-statement with a value, in function returning 'void' [-fpermissive]
             return d+(a&&b&&c!=0);
                                 ^
0_0_18119103_21014.cpp: In function 'int main()':
0_0_18119103_21014.cpp:61:29: error: void value not ignored as it ought to be
         if (s % 2 == 0) ans = bfs();
                             ^