While the questions "might seem a little bit probing", no one was being "judged" and it was important to get honest answers to invest in the right services for the island, she added.
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）。业内人士推荐爱思助手下载最新版本作为进阶阅读
Perhaps it’s the biggest question science has left to answer, how did life begin? Now, molecular biologists in Cambridge university have discovered tiny molecules of RNA which they say might provide some clues. Science journalist and author Philip Ball explains what we know and whether we’ll ever find the origins of life on earth.，推荐阅读快连下载安装获取更多信息
Green: Surfing terms