Fermat’s Chirstmas Theorem (素数打表的)

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Fermat’s Chirstmas Theorem (素数打表的)

Fermat’s Chirstmas Theorem Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%lld & %llu Submit Status Practice SDUTOJ 2093 Description In a letter dated December 2…

SDUT Fermat’s Chirstmas Theorem(素数筛)

Fermat's Chirstmas Theorem Time Limit: 1000ms Memory limit: 65536K 有疑问?点这里^_^ 题目描写叙述 In a letter dated December 25, 1640; the great mathematician Pierre de Fermat wrote to Marin Mersenne that he just proved that an odd prime p is expressible as p…

hdu 5104 素数打表水题

http://acm.hdu.edu.cn/showproblem.php?pid=5104 找元组数量,满足p1<=p2<=p3且p1+p2+p3=n且都是素数不用素数打表都能过,数据弱的一比 #include <cstdio> #include <cstdlib> #include <cmath> #include <cstring> #include <string> #include <queue> #inclu…

HDU 1397 Goldbach's Conjecture【素数打表】

题意:给出n,问满足a+b=n且a,b都为素数的有多少对将素数打表,再枚举 #include<iostream> #include<cstdio> #include<cstring> #include <cmath> #include<stack> #include<vector> #include<map> #include<algorithm> #define mod=1e9+7; using names…

Codeforces Round #315 (Div. 2C) 568A Primes or Palindromes? 素数打表+暴力

题目:Click here 题意:π(n)表示不大于n的素数个数,rub(n)表示不大于n的回文数个数,求最大n,满足π(n) ≤ A·rub(n).A=p/q; 分析:由于这个题A是给定范围的,所以可以先暴力求下最大的n满足上式,可以想象下随着n的增大A也在增大(总体正相关,并不是严格递增的),所以二分查找时不行的,所以对给定的A,n是一定存在的.这个题的关键就是快速得到素数表最好在O(n)的时间以内.(杭电15多校的一个题也用到了这个算法点这里查看) #include <bits/stdc+…

CodeForces 385C Bear and Prime Numbers 素数打表

第一眼看这道题目的时候觉得可能会很难也看不太懂,但是看了给出的Hint之后思路就十分清晰了 Consider the first sample. Overall, the first sample has 3 queries. The first query l = 2, r = 11 comes. You need to count f(2) + f(3) + f(5) + f(7) + f(11) = 2 + 1 + 4 + 2 + 0 = 9. The second query comes…