Permutations【python】 classSolution:#@param num, a list of integer#@return a list of lists of integersdefpermute(self, num): length=len(num)iflength==1:return[num]else: res=[]foriinrange(length): d=self.permute(num[0:i]+num[i+1:length])forjind: res.append(j+[num[i]])#去除重...
visited 数组表示是否访问过这个位置。 Python3代码 classSolution:defpermute(self, nums:List[int]) ->List[List[int]]:# solution three: backtrackingvisited = [0] *len(nums) res = []defdfs(path):iflen(path) ==len(nums): res.append(path)else:foriinrange(len(nums)):ifnotvisited[i]: vi...
class Solution(object): def permute(self, nums): """ :type nums: List[int] :rtype: List[List[int]] """ print 'nums', nums if len(nums) <= 1: return [nums] ans = [] for i, num in enumerate(nums): n = nums[:i] + nums[i+1:] # n是剩余数的list print nums[:i], ...
A[1] + permutation of (A[1..n] - A[1]) A[2] + permutation of (A[1..n] - A[2]) ... A[n] + permutation of (A[1..n] - A[n]). class Solution: def permute(self, nums: List[int]) -> List[List[int]]: if not nums: return [] self.res = [] def backtracking(i...
1. 使用 itertools生成排列和组合: from itertools import permutations, combinations items = [1, 2, 3] perms = list(permutations(items, 2)) combs = list(combinations(items, 2)) print(perms, combs) 2. …
get_permute(nums) def get_permute(self, nums): if len(nums) <= 1: return [nums] ans = [] for i, num in enumerate(nums): if i == 0 or nums[i] != nums[i - 1]: # 加一行对比前一个数 n = nums[:i] + nums[i+1:] # n是剩余数的list for y in self.get_permute(n):...
https://docs.python.org/dev/library/itertools.html#itertools.combinations itertools.combinations(iterable,r) Returnrlength subsequences of elements from the inputiterable. Combinations are emitted in lexicographic sort order. So, if the inputiterableis sorted...
(iterable, r): # combinations('ABCD', 2) --> AB AC AD BC BD CD # combinations(range(4), 3) --> 012 013 023 123 pool = tuple(iterable) n = len(pool) if r > n: return indices = list(range(r)) yield tuple(pool[i] for i in indices) while True: for i in reversed(...
This code runs as expected,permutationsis casted tolist. fromitertoolsimportpermutationsperms=list(permutations([1,2,3]))forpinperms:print(p)print('hello')forpinperms:print(p)## Returns:# (1, 2, 3)# (1, 3, 2)# (2, 1, 3)# (2, 3, 1)# (3, 1, 2)# (3, 2, 1)# hello#...
:type nums: List[int] :rtype: List[List[int]] """ res = [] visited = set([]) def dfs(nums, path, res, visited): if len(path) == len(nums): res.append(path + []) return for i in xrange(0, len(nums)): # if i > 0 and nums[i - 1] == nums[i]: ...