Because of its capacity to be freeze-dried and reconstituted, agar is considered a “physical jelly” (that is, a jelly that sets and melts with temperature changes without needing any additives). This property makes dry agar easy to ship and preserve for long periods of time.5
if (right < n) {
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// 1. 将当日价格存入数组，记录当前索引（i是当前价格在arr中的位置）