unordered_map :unordered_map内部实现了一个哈希表 （也叫散列表，通过把关键码值映射到Hash表中一个位置来访问记录，查找的时间复杂度可达到O (1)，其在海量数据处理中有着广泛应用）。 因此，其元素的排列顺序都是无序的。

According to Section 3009 in the U.S. code, unordered items “may be treated as a gift by the recipient, who shall have the right to retain, use, discard, or dispose of it in any manner he sees ...

Heaven McGeehan awoke one morning to find an unexpected package from China delivered to her Pennsylvania home. It was a small epacket -- a special subsidized shipping option that the USPS offers ...

Goodwin said unordered packages from Amazon and other online sellers are appearing on the doorsteps of recipients without a return address and simply appearing to be from the retailer.

Unordered empty package from Kyrgyzstan. Lisa Klebba This has become a regular occurrence since I published that article nearly two years ago. People all over the United States are still receiving ...

A popular scam is known as 'brushing', an unordered package that shows up on your doorstep. It has your address but no information on the sender; however, you can bet that someone is benefiting ...

Believe it or not, you have a legal right to keep unordered merchandise. “By law, companies can’t send unordered merchandise to you, then demand payment,” the Federal Trade Commission (FTC ...

If you receive a packet of seeds in the mail that you didn't order from overseas, don't throw them out or plant them, according to the state Department of Agriculture. It's likely part of a scam ...