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相較之下，YouGov是「自願參加」的調查平台，人們自行報名以換取積分，積分可兌換現金。
I found one dumb free win (I mistakenly used value receivers on a utility function called on a large struct thousands of times a frame). But the rest of the speedups I found took more effort.
if (stack.length === 0 && cur === 0) {