/in/foo.cc: In function 'int main()':
/in/foo.cc:11:6: error: 'i' was not declared in this scope
  for(i=1;i<=m;i++)scanf("%d",&a[i]);
      ^
/in/foo.cc:13:6: error: 'i' was not declared in this scope
  for(i=1;i<=m;i++)
      ^
/in/foo.cc:17:6: error: 'i' was not declared in this scope
  for(i=x;i<=252000;i++){
      ^
/in/foo.cc:18:7: error: 'j' was not declared in this scope
   for(j=x;j<=y;j++){
       ^