/in/foo.cc: In function 'int main()':
/in/foo.cc:13:12: error: 'Ans' was not declared in this scope
   if(j<=m) Ans+=b[j];
            ^~~
/in/foo.cc:19:11: error: 'Ans' was not declared in this scope
     cout<<Ans<<endl;
           ^~~
/in/foo.cc:10:9: warning: unused variable 'ans' [-Wunused-variable]
     int ans=0;
         ^~~