/in/foo.cc: In function 'void adds(int, int)':
/in/foo.cc:11:7: warning: statement has no effect [-Wunused-value]
  for(x;x<=n;x+=x&(-x))c[x]+=y;
       ^
/in/foo.cc: In function 'int ask(int)':
/in/foo.cc:15:7: warning: statement has no effect [-Wunused-value]
  for(x;x;x-=x&(-x))ans+=c[x];
       ^