Jump Game II

public class Solution {
    public int jump(int[] A) {
        // Start typing your Java solution below
        // DO NOT write main() function
        if(A==null)return 0;
        int len = A.length;
        int now = len - 1;
        int count = 0;
        while(now != 0){
            for(int i = 0; i < now; i++){
                if(A[i]>=now-i){
                    count++;
                    now = i;
                    break;
                }
            }
        }
        return count;
    }
}

從終點往回跳