Even with current policies to reduce our emissions, global temperatures are expected to have increased by at least 2.5C by the end of the century, according to the United Nations.
合并过程：用临时数组，双指针比较两个子数组元素，小的先放入，推荐阅读同城约会获取更多信息
Watch: Moment Jim Lovell told earth "Houston, we've had a problem" as Apollo 13 suffered a fault。91视频对此有专业解读
bucketArr[k + 1] = bucketArr[k];