A-1 Fill in the NumbersA-2 PeekMax in StackA-3 AB with Binary Search TreesA-4 Transportation Hub
A-1 Fill in the Numbers
diagonal this word is the most import key in this question. As many people don’t know the meaning of that including me, there’re lo…
Problem - F - Codeforces
这道题有个很简单的思路,也有一个很难的思路,这个很难的思路用到了树状数组(但是是大佬写的),而简单的思路仅仅用到了归并排序求逆序对(也是一个大佬写的),而我连简单的思路都没想到,(*/ω&…