在Python中找到具有恒定差异的最长算术子序列的长度的程序
假设我们有一个数字列表nums和另一个值diff,我们必须找到最长算术子序列的长度,其中子序列中任何连续数字之间的差异与diff相同。
所以,如果输入像nums=[-1,1,4,7,2,10]diff=3,那么输出将是4,因为,我们可以选择像[1,4,7,10这样的子序列]。
示例
让我们看看以下实现以获得更好的理解-
from collections import defaultdict def solve(nums, diff): seen = defaultdict(int) mx = 0 for x in nums: if x - diff in seen: seen[x] = seen[x - diff] + 1 else: seen[x] = 1 mx = max(mx, seen[x]) return mx nums = [-1, 1, 4, 7, 2, 10] diff = 3 print(solve(nums, diff))
输入
[-1, 1, 4, 7, 2, 10], 3输出结果
4