BZOJ-3212: Pku3468 A Simple Problem with Integers
题目:http://www.lydsy.com/JudgeOnline/problem.php?id=3212**思路:简单的树状数组维护求和就可以啦~**(详细区间修改方法:https://www.jianshu.com/p/b93b3a55d21e)代码(很短~):#include#include#include#definerep(a,b)for(inti=a;i<=b;i++)#defin