leetcode08-棒球比赛

题目链接：

https://leetcode.cn/problems/baseball-game/description/?envType=study-plan-v2&envId=programming-skills

思路：

模拟题，思路见代码即可。 

代码：

class Solution {
    public int calPoints(String[] operations) {
        int[] sum = new int[1010];
        int n = operations.length;
        int idx= 0,res = 0;
        //进行模拟
        for(int i = 0;i<n;i++,idx++) {
            if(operations[i].equals("+")) {
                sum[idx] = sum[idx-1]+sum[idx-2];
            }
            else if(operations[i].equals("D")) {
                sum[idx] = sum[idx-1]*2;
            }
            else if(operations[i].equals("C")) {
                idx-=2;
            }
            else {
                sum[idx] = Integer.parseInt(operations[i]);
            }
        }
        for(int i =0;i<idx;i++)
            res+=sum[i];

        return res;
    }
}