这种“重资产”的服务投入，看似是成本支出，实际也为平台赋能产业提供了信用背书：因为背后有了平台兜底，中小商户才敢于接待复杂的国际订单；因为知道遇到困难能获得有效救援，游客也才敢于探索非标的小众目的地。
In his simulations, it was extremely rare for someone to have their mutual first picks; but many people had those that were second or third picks. In this scenario a couple counts as happy if each is near the top of the other's list and neither can find someone they and that other person would both prefer more.
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if (leftArr[i] <= arr[mid + j]) {