/in/foo.cc: In function 'int main()':
/in/foo.cc:32:27: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
   scanf("%d%d",&w[i],&v[i]);
                           ^
/in/foo.cc:32:27: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]
/in/foo.cc:39:12: warning: unused variable 'ans' [-Wunused-variable]
  long long ans=0;
            ^~~