static void mergeSort ( long a [ ] , int left , int right ) {
  if ( left >= right ) {
    return ;
  }
  int mid = ( left + right ) / 2 ;
  mergeSort ( a , left , mid ) ;
  mergeSort ( a , mid + 1 , right ) ;
  merge ( a , left , right , mid ) ;
}

static void mergeSort ( long a [ ] , int left , int right ) { if ( left >= right ) { return ; } int mid = ( left + right ) / 2 ; mergeSort ( a , left , mid ) ; mergeSort ( a , mid + 1 , right ) ; merge ( a , left , right , mid ) ; }
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