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This topic created in 2735 days ago, the information mentioned may be changed or developed.

a = [1,2,4]
b = [1,2,3,4,5,6]

想输出一个结果，c 是 a 和 b 的并集，但每个值要标明是否是交集，如

c = {"1" :True, "2" :True, "3" :False, "4": True, "5": False, "6":False}

应该怎么处理？😭

9 replies • 2018-12-11 10:35:41 +08:00

kkkkkrua

Dec 10, 2018

leetcode，交集

asLw0P981N0M0TCC

Dec 10, 2018

都是有序的话我记得有个是 2 个从头互相比较的好像要额外空间存储

AlisaDestiny

Dec 10, 2018

```python
a = [1,2,4]
b = [1,2,3,4,5,6]

u = set(a+b)
r = {}
for x in u:
r[str(x)] = (x in a and x in b)
print(r)
```

css3

Dec 10, 2018

@kkkkkrua @qwertyzzz @AlisaDestiny

感谢各位☺

nichijou

Dec 10, 2018

第一个依次存入哈希字典, key 是 number, value 是 false

然后遍历第二个，有的改 true, 没的存 key: false

smdbh

Dec 10, 2018

L3 +1

zxcvsh

Dec 10, 2018 via iPhone

推荐 3 楼，5 楼也可行，但是 3 楼相对有优化

v2gba

Dec 10, 2018

>>> s1 = collections.Counter(a+b)
>>> s2 = collections.Counter(set(a+b))
>>> s1.subtract(s2)
>>> s1
Counter({1: 1, 2: 1, 4: 1, 3: 0, 5: 0, 6: 0})

css3

Dec 11, 2018

@nichijou @smdbh @zxcvsh @MrGba2z
多谢😀