SPOJ 902. Hangover.py

題目網址：連結 (opens new window)

解題報告

• 浮點數與 $0$ 比較 (包含誤差)

def fzero(fa):
		delta = 1e-5
		return -1 if fa < -delta else ( fa > delta )

from sys import stdin

def fzero(fa):
	delta = 1e-5
	return -1 if fa < -delta else ( fa > delta )

ar1, ln1 = [.0]*300, 1
while ln1<300 and fzero(ar1[ln1-1]-5.20)<1:
	ar1[ln1],ln1 = ar1[ln1-1]+1/(ln1+1), ln1+1
ar1[ln1],ln1 = 10.0, ln1+1
while True:
	fa = float(stdin.readline())
	if not fzero(fa):
		break
	for i in range(ln1):
		if fzero(fa-ar1[i])<0:
			print(i,'card(s)')
			break