Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers.
Example 1:
Input: k = ...
在python中,据我所知,至少有3到4种方法来创建和初始化给定大小的列表:
简单循环append:
my_list = []
for i in range(50):
my_list.append(0)
简单循环+=:
my_list = []
for i in range(50):
my_lis...