static void cal_prefix ( int n , int arr [ ] ) {
  int i , j ;
  for ( i = 0 ;
  i < n ;
  i ++ ) ar [ i + 1 ] = arr [ i ] ;
  for ( i = 1 ;
  i <= 1000 ;
  i ++ ) {
    for ( j = 0 ;
    j <= n ;
    j ++ ) prefix [ i ] [ j ] = 0 ;
    for ( j = 1 ;
    j <= n ;
    j ++ ) {
      prefix [ i ] [ j ] = prefix [ i ] [ j - 1 ] + ( int ) ( ar [ j ] <= i ? 1 : 0 ) ;
    }
  }
}

static void cal_prefix ( int n , int arr [ ] ) { int i , j ; for ( i = 0 ; i < n ; i ++ ) ar [ i + 1 ] = arr [ i ] ; for ( i = 1 ; i <= 1000 ; i ++ ) { for ( j = 0 ; j <= n ; j ++ ) prefix [ i ] [ j ] = 0 ; for ( j = 1 ; j <= n ; j ++ ) { prefix [ i ] [ j ] = prefix [ i ] [ j - 1 ] + ( int ) ( ar [ j ] <= i ? 1 : 0 ) ; } } }
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