sort() 是<algorithm>中
default (1)
template <class RandomAccessIterator>
void sort (RandomAccessIterator first, RandomAccessIterator last);
custom (2)
template <class RandomAccessIterator, class Compare>
void sort (RandomAccessIterator first, RandomAccessIterator last, Compare comp);
RandomAccessIterator
Compare：函數(shù)枫吧，接收2個(gè)參數(shù)，返回bool值直奋，表明這2個(gè)數(shù)是否滿足順序
默認(rèn)的comparison為<能庆，接收1和2，1和2滿足"<"的順序么脚线？ 滿足搁胆，返回true
調(diào)用sort()后的序列是有序且順序的
參考
sort - C++ Reference sort()的聲明
關(guān)于C++各類排序算法與std::sort性能的比較 各種排序方法時(shí)間比較
linux - What makes the gcc std::list sort implementation so fast? - Stack Overflow
