Submission #768347

#	Time	Username	Problem	Language	Result	Execution time	Memory
768347		iamjiamingliu	Bank (IZhO14_bank)	Pypy 3	0 / 100	33 ms	18240 KiB

bank

people = [int(i) for i in input().split()]
banknotes = [int(i) for i in input().split()]

leftover = [-1 for _ in range(1 << len(banknotes))]
people_covered = [-1 for _ in range(1 << len(banknotes))]
leftover[0] = 0
people_covered[0] = 0
for s in range(1, 1 << len(banknotes)):
	for last in range(len(banknotes)):
		if (s & (1 << last)) == 0:
			continue
		prev = s & ~(1 << last)
		if people_covered[prev] == -1:
			continue

		new_amt = leftover[prev] + banknotes[last]
		# the salary of the current person we're going to try to pay
		curr_target = people[people_covered[prev]]
		# if it's still not enough, just increment the leftover pile
		if new_amt < curr_target:
			people_covered[s] = people_covered[prev]
			leftover[s] = new_amt
			"""
			or it's exactly right, in which case reset the leftover count
			and increment the covered amount
			"""
		elif new_amt == curr_target:
			people_covered[s] = people_covered[prev] + 1
			leftover[s] = 0

	# we've covered all the people!
	if people_covered[s] == len(people):
		print("YES")
		exit()
print("NO")

• Subtask 1: 0 / 19
• Subtask 2: 0 / 25
• Subtask 3: 0 / 27
• Subtask 4: 0 / 29