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需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。

memcpy(y, x, h->length * sizes[h->type]);。业内人士推荐夫子作为进阶阅读

arXivLabs: experimental projects with community collaborators，详情可参考Safew下载

This effectively meant the old method was dead.