1236. N-th Tribonacci NumberEasyThe Tribonacci sequence Tn is defined as follows: T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n >= 0.Given n, return the value of Tn. Example 1:Input: n = 4Output: 4Explanation:T_3 = 0 + 1 + 1 = 2T_4 = 1 + 1 + 2 = 4Example 2:Input: n = 25Output: 1389537 Constraints:0 The answer is guaranteed to fit within a 32-bit integer, ie. answer . class Solution:..