N-th Tribonacci Number
给一个数字n, 返回三位bonacci数.
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class Solution { public int tribonacci(int n) { int[] dp = new int[n+1]; if(n == 0) return 0; if(n == 1) return 1; if(n == 2) return 1; dp[0] = 0; dp[1] = 1; dp[2] = 1; for(int i = 3; i <=n; i++){ dp[i] = dp[i-1] + dp[i-2] + dp[i-3]; } return dp[n]; } } |