一、题目

二、代码

class Solution {public int fib(int n) {if (n <= 1) {return n;}int[] f = new int[n + 1];f[0] = 0;f[1] = 1;for (int i = 2; i <= n; i++) {f[i] = f[i - 1] + f[i - 2];}return f[n];}
}