/in/foo.cc: In function 'int main()':
/in/foo.cc:16:13: error: 'i' was not declared in this scope
   y=y+score[i]*w[i];
             ^
/in/foo.cc:19:7: warning: unused variable 'ans' [-Wunused-variable]
   int ans=0;
       ^~~
/in/foo.cc:22:7: warning: unused variable 'ans' [-Wunused-variable]
   int ans=y;
       ^~~