View Compilation Error

0_0_33697602_28240.cpp: In function 'int main()':
0_0_33697602_28240.cpp:24:9: error: 'ans' was not declared in this scope
         ans=0;
         ^
0_0_33697602_28240.cpp:42:25: error: 'sum' was not declared in this scope
              num=(num+j*sum[n]-sumx[j-1]-sumy[j-1]+mod)%mod*quick(j,mod-2)%mod;   
                         ^
0_0_33697602_28240.cpp:45:40: error: 'w' was not declared in this scope
             printf("%lld\n",(ll)(num)*(w,mod-2)%mod);
                                        ^
0_0_33697602_28240.cpp: At global scope:
0_0_33697602_28240.cpp:47:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_33697602_28240.cpp:48:1: error: expected declaration before '}' token
 } 
 ^