res[i] = stack.length ? stack.at(-1) : -1;
第二个问题在于，狗加双臂是一个非标的构型，我觉得我们做机器人公司，一定要杜绝按照非标的构型思路。因为非标意味着无法放量——今天臂长要1.5米，明天要2米；今天精度0.1毫米，明天要1毫米——这样就会量上不去，成本降不下来，算法也无法复用。
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