_1137

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Published: Feb 20, 2024 License: MIT Imports: 0 Imported by: 0

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第 N 个泰波那契数

泰波那契序列 Tn 定义如下: 

T0 = 0, T1 = 1, T2 = 1, 且在 n >= 0 的条件下 Tn+3 = Tn + Tn+1 + Tn+2

给你整数 n,请返回第 n 个泰波那契数 Tn 的值。

示例 1:

输入:n = 4
输出:4
解释:
T_3 = 0 + 1 + 1 = 2
T_4 = 1 + 1 + 2 = 4

示例 2:

输入:n = 25
输出:1389537

提示:

  • 0 <= n <= 37
  • 答案保证是一个 32 位整数,即 answer <= 2^31 - 1

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