static int minimumAdjacentDifference ( int a [ ] , int n , int k ) {
  int minDiff = Integer . MAX_VALUE ;
  for ( int i = 0 ;
  i < ( 1 << n ) ;
  i ++ ) {
    int cnt = Integer . bitCount ( i ) ;
    if ( cnt == n - k ) {
      Vector < Integer > temp = new Vector < Integer > ( ) ;
      for ( int j = 0 ;
      j < n ;
      j ++ ) {
        if ( ( i & ( 1 << j ) ) != 0 ) temp . add ( a [ j ] ) ;
      }
      int maxDiff = Integer . MIN_VALUE ;
      for ( int j = 0 ;
      j < temp . size ( ) - 1 ;
      j ++ ) {
        maxDiff = Math . max ( maxDiff , temp . get ( j + 1 ) - temp . get ( j ) ) ;
      }
      minDiff = Math . min ( minDiff , maxDiff ) ;
    }
  }
  return minDiff ;
}

static int minimumAdjacentDifference ( int a [ ] , int n , int k ) { int minDiff = Integer . MAX_VALUE ; for ( int i = 0 ; i < ( 1 << n ) ; i ++ ) { int cnt = Integer . bitCount ( i ) ; if ( cnt == n - k ) { Vector < Integer > temp = new Vector < Integer > ( ) ; for ( int j = 0 ; j < n ; j ++ ) { if ( ( i & ( 1 << j ) ) != 0 ) temp . add ( a [ j ] ) ; } int maxDiff = Integer . MIN_VALUE ; for ( int j = 0 ; j < temp . size ( ) - 1 ; j ++ ) { maxDiff = Math . max ( maxDiff , temp . get ( j + 1 ) - temp . get ( j ) ) ; } minDiff = Math . min ( minDiff , maxDiff ) ; } } return minDiff ; }
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