递归思路
class Solution {
public int fib(int n) {
if(n == 0){
return 0;
}
if(n == 1){
return 1;
}
return fib(n - 1) + fib(n -2);
}
}
动态规划思路
class Solution {
public int fib(int n) {
if (n <= 1) return n;
int[] dp = new int[n + 1];
dp[0] = 0;
dp[1] = 1;
for (int i = 2; i <= n; i++) {
dp[i] = dp[i - 1] + dp[i - 2];
}
return dp[n];
}
}
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