View Compilation Error

0_0_35962436_22786.cpp:101:67: error: 'res' does not name a type
    printf("ll%d\n",/*(sum(bn,cst)%mod-sum(an-1,cst)%mod+mod)%mod*/res);
                                                                   ^
0_0_35962436_22786.cpp:102:3: error: expected declaration before '}' token
   }
   ^