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剑指 Offer II 080. 含有 k 个元素的组合 回溯
2022-06-30 15:33:00 【Python ml】
class Solution:
def combine(self, n: int, k: int) -> List[List[int]]:
temp_ans,ans=[],[]
def BackTrack(cur_index:int):
if len(temp_ans)==k:
ans.append(temp_ans[:])
elif cur_index>n:
return
else:
temp_ans.append(cur_index)
BackTrack(cur_index+1)
temp_ans.pop()
BackTrack(cur_index+1)
BackTrack(1)
return ans
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