static long binomialCoeff ( int n , int k ) {
  long res = 1 ;
  if ( k > n - k ) k = n - k ;
  for ( int i = 0 ;
  i < k ;
  ++ i ) {
    res *= ( n - i ) ;
    res /= ( i + 1 ) ;
  }
  return res ;
}

static long binomialCoeff ( int n , int k ) { long res = 1 ; if ( k > n - k ) k = n - k ; for ( int i = 0 ; i < k ; ++ i ) { res *= ( n - i ) ; res /= ( i + 1 ) ; } return res ; }
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