Re: [閒聊] 每日leetcode
https://leetcode.com/problems/n-th-tribonacci-number/description
1137. N-th Tribonacci Number
給你一個數字n，求出第 n 個 Tribonacci 數列是多少。
思路：
1.動態規劃，然後把空間壓一壓。
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class Solution:
def tribonacci(self, n: int) -> int:
if n == 0:
return 0
if n <= 2:
return 1
n1, n2, n3 = 0, 1, 1
for i in range(3, n + 1):
n1, n2, n3 = n2, n3, n1 + n2 + n3
return n3
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