static void sort ( int arr [ ] , int l , int r ) {
  if ( l < r ) {
    int m = ( l + r ) / 2 ;
    sort ( arr , l , m ) ;
    sort ( arr , m + 1 , r ) ;
    merge ( arr , l , m , r ) ;
  }
}

static void sort ( int arr [ ] , int l , int r ) { if ( l < r ) { int m = ( l + r ) / 2 ; sort ( arr , l , m ) ; sort ( arr , m + 1 , r ) ; merge ( arr , l , m , r ) ; } }
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