Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with many excellent…
给[L,R]区间的每一个数都质因数分解的复杂度可以达到(R-L)logR,真的涨姿势…… 另外,质因数分解有很重要的一点,就是只需要打sqrt(R)以内的素数表就够了……因为超过sqrt(R)的至多只有一个,分解其他的那些剩下的就是了. 果然学习的过程中要精益求精,把时间和空间都尽量降到最低. 此外还有一个很重要的公式.d(i)表示i的因子个数.那么 #include<bits/stdc++.h> using namespace std; typedef long long ll; ; ];…
http://acm.hdu.edu.cn/showproblem.php?pid=1045 Fire Net Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1045 Description Suppose that we have a square city with straight streets. A map of a city…
J - 数论,质因数分解 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Submit Status Description Tomorrow is contest day, Are you all ready? We have been training for 45 days, and all guys must be tired.But , you are so lucky compa…