static int cntSubSeq ( int arr [ ] , int n , int k ) {
  Arrays . sort ( arr ) ;
  int num = arr [ k - 1 ] ;
  int Y = 0 ;
  for ( int i = k - 1 ;
  i >= 0 ;
  i -- ) {
    if ( arr [ i ] == num ) Y ++ ;
  }
  int cntX = Y ;
  for ( int i = k ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] == num ) cntX ++ ;
  }
  return binomialCoeff ( cntX , Y ) ;
}

static int cntSubSeq ( int arr [ ] , int n , int k ) { Arrays . sort ( arr ) ; int num = arr [ k - 1 ] ; int Y = 0 ; for ( int i = k - 1 ; i >= 0 ; i -- ) { if ( arr [ i ] == num ) Y ++ ; } int cntX = Y ; for ( int i = k ; i < n ; i ++ ) { if ( arr [ i ] == num ) cntX ++ ; } return binomialCoeff ( cntX , Y ) ; }
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