Merge pull request #233 from Chen-Wang-JY/master

更新了 0017.电话号码的字母组合.md 的Python3代码
This commit is contained in:
Carl Sun
2021-05-26 09:23:08 +08:00
committed by GitHub

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@ -282,6 +282,43 @@ class Solution {
```
Python
```Python
class Solution:
ans = []
s = ''
letterMap = {
'2': 'abc',
'3': 'def',
'4': 'ghi',
'5': 'jkl',
'6': 'mno',
'7': 'pqrs',
'8': 'tuv',
'9': 'wxyz'
}
def letterCombinations(self, digits):
self.ans.clear()
if digits == '':
return self.ans
self.backtracking(digits, 0)
return self.ans
def backtracking(self, digits, index):
if index == len(digits):
self.ans.append(self.s)
return
else:
letters = self.letterMap[digits[index]] # 取出数字对应的字符集
for letter in letters:
self.s = self.s + letter # 处理
self.backtracking(digits, index + 1)
self.s = self.s[:-1] # 回溯
```
python3
```python3
class Solution:
def letterCombinations(self, digits: str) -> List[str]:
@ -302,6 +339,7 @@ class Solution:
return res
```
Go