arr[k++] = leftArr[i++];
This fragmentation hurts portability. Code that performs well on one runtime may behave differently (or poorly) on another, even though it's using "standard" APIs. The complexity burden on runtime implementers is substantial, and the subtle behavioral differences create friction for developers trying to write cross-runtime code, particularly those maintaining frameworks that must be able to run efficiently across many runtime environments.
。关于这个话题，Line官方版本下载提供了深入分析
int n2 = right - mid; // 右子数组长度
今年前三季度销售开支到了 12.80 亿，比去年一整年花的还多……
Жители Санкт-Петербурга устроили «крысогон»17:52