题解 | #跳台阶#

public class Solution {
    public int jumpFloor(int target) {
        if(target <= 1){
            return 1;
        }
        int a = 1;
        int b = 1;
        int sum = 0;
        for(int i = 2; i <= target; i++){
            sum = a + b;
            a = b;
            b = sum;
        }
        return sum;
    }
}