static void merge ( int arr [ ] , int l , int m , int r ) {
  int n1 = m - l + 1 ;
  int n2 = r - m ;
  int L [ ] = new int [ n1 ] ;
  int R [ ] = new int [ n2 ] ;
  for ( int i = 0 ;
  i < n1 ;
  ++ i ) L [ i ] = arr [ l + i ] ;
  for ( int j = 0 ;
  j < n2 ;
  ++ j ) R [ j ] = arr [ m + 1 + j ] ;
  int i = 0 , j = 0 ;
  int k = l ;
  while ( i < n1 && j < n2 ) {
    if ( L [ i ] <= R [ j ] ) {
      arr [ k ] = L [ i ] ;
      i ++ ;
    }
    else {
      arr [ k ] = R [ j ] ;
      j ++ ;
    }
    k ++ ;
  }
  while ( i < n1 ) {
    arr [ k ] = L [ i ] ;
    i ++ ;
    k ++ ;
  }
  while ( j < n2 ) {
    arr [ k ] = R [ j ] ;
    j ++ ;
    k ++ ;
  }
}

static void merge ( int arr [ ] , int l , int m , int r ) { int n1 = m - l + 1 ; int n2 = r - m ; int L [ ] = new int [ n1 ] ; int R [ ] = new int [ n2 ] ; for ( int i = 0 ; i < n1 ; ++ i ) L [ i ] = arr [ l + i ] ; for ( int j = 0 ; j < n2 ; ++ j ) R [ j ] = arr [ m + 1 + j ] ; int i = 0 , j = 0 ; int k = l ; while ( i < n1 && j < n2 ) { if ( L [ i ] <= R [ j ] ) { arr [ k ] = L [ i ] ; i ++ ; } else { arr [ k ] = R [ j ] ; j ++ ; } k ++ ; } while ( i < n1 ) { arr [ k ] = L [ i ] ; i ++ ; k ++ ; } while ( j < n2 ) { arr [ k ] = R [ j ] ; j ++ ; k ++ ; } }
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