View Compilation Error

0_0_38337797_28603.cpp: In function 'void solve()':
0_0_38337797_28603.cpp:18:27: error: return-statement with a value, in function returning 'void' [-fpermissive]
  if(!c1&&!c2&&!c3) return 0;
                           ^
0_0_38337797_28603.cpp:30:11: error: return-statement with a value, in function returning 'void' [-fpermissive]
    return 1;
           ^
0_0_38337797_28603.cpp:33:9: error: return-statement with a value, in function returning 'void' [-fpermissive]
  return 1;
         ^
0_0_38337797_28603.cpp: In function 'int main()':
0_0_38337797_28603.cpp:37:13: error: could not convert 'solve()' from 'void' to 'bool'
   if(!solve()) break;
             ^
0_0_38337797_28603.cpp:37:13: error: in argument to unary !