有以下代码:
import sys
ints = [1,2,3,4,5,6,8,9,10,11,14,34,14,35,16,18,39,10,29,30,14,26,64,27,48,65]
ints.sort()
ints = list(set(ints))
c = {}
for i,v in enumerate(ints):
if i+1 >= len(ints):
continue
if ints[i+1] == v + 1 or ints[i-1] == v - 1:
if len(c) == 0:
c[v] = [v]
c[v].append(ints[i+1])
else:
added=False
for x,e in c.items():
last = e[-1]
if v in e:
added=True
break
if v - last == 1:
c[x].append(v)
added=True
if added==False:
c[v] = [v]
else:
if v not in c:
c[v] = [v]
print('input ', ints)
print('output ', c))
目标:
给定一个整数列表,创建一个包含连续整数的字典,以减少列表的总长度.
这是我当前解决方案的输出:
input [1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 14, 16, 18, 26, 27, 29, 30, 34, 35, 39, 48, 64, 65]
output {1: [1, 2, 3, 4, 5, 6], 8: [8, 9, 10, 11], 14: [14], 16: [16], 18: [18], 26: [26, 27], 29: [29, 30], 34: [34, 35], 39: [39], 48: [48], 64: [64]}
条件/限制:
>如果当前整数是现有列表中的a)或b)是现有列表中的最后一项,我们不希望为此项创建另一个列表.
即在1-5范围内,当我们到达3时,不要创建列表3,4,而是将3添加到现有列表[1,2]
我当前的迭代工作正常,但是由于c.items()现有列表检查中的for x,e,列表越大,它就会指数越慢.
如何在实现相同结果的同时加快速度?
新解决方案(使用19,000个整数的输入列表,从13秒到0.03秒):
c = {}
i = 0
last_list = None
while i < len(ints):
cur = ints[i]
if last_list is None:
c[cur] = [cur]
last_list = c[cur]
else:
if last_list[-1] == cur-1:
last_list.append(cur)
else:
c[cur] = [cur]
last_list = c[cur]
i += 1
最佳答案 由于您有连续数字列表,我建议您使用范围对象而不是列表:
d, head = {}, None
for x in l:
if head is None or x != d[head].stop:
head = x
d[head] = range(head, x+1)