Submission #856386

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Source Code Expand

N, A = gets.split(/ /).collect{|i| i.to_i}


list_s = []
count_j = 0
list_l = []

gets.split(/ /).collect{|x|
	x = x.to_i
	if x == A
		count_j += 1
	elsif x < A
		list_s << (A - x)
	elsif
		list_l << (x - A)
	end
}

def make_patterns(list)
	results = {0 => 1}
	
	list.each{|x|
		new_results = {}
		results.each{|sum, count|
			if new_results[sum]
				new_results[sum] += count
			else
				new_results[sum] = count
			end
			
			new_sum = sum + x
			if new_results[new_sum]
				new_results[new_sum] += count
			else
				new_results[new_sum] = count
			end
		}
		results = new_results
	}
	
	results
end

results_s = make_patterns(list_s)
results_l = make_patterns(list_l)

pattern_count_j = 2 ** count_j
count = pattern_count_j - 1
results_s.each{|sum_s, count_s|
	if sum_s > 0 && count_l = results_l[sum_s]
		count += count_s * count_l * pattern_count_j
	end
}

p count

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