Prime Distance POJ - 2689 （数学素数）

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Prime Distance POJ - 2689 （数学素数）

The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is has no prop…

Prime Distance POJ - 2689 线性筛

一个数 $n$ 必有一个不超过 $\sqrt n$ 的质因子. 打表处理出 $1$ 到 $\sqrt n$ 的质因子后去筛掉属于 $L$ 到 $R$ 区间的素数即可. Code: #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> using namespace std; const int Range=50000; const int N=1000000+233…

[ACM] POJ 2689 Prime Distance (筛选范围大素数）

Prime Distance Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 12811 Accepted: 3420 Description The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number th…

POJ2689 Prime Distance（数论：素数筛选模板）

题目链接:传送门题目: Prime Distance Time Limit: 1000MS Memory Limit: 65536K Total Submissions: Accepted: Description The branch of mathematics called number theory and itself). The first prime numbers are ,,, but they quickly become less frequent. One of the…

poj 2689 Prime Distance(大区间筛素数)

http://poj.org/problem?id=2689 题意:给出一个大区间[L,U],分别求出该区间内连续的相差最小和相差最大的素数对. 由于L<U<=2147483647,直接筛素数是不行的,数组就开不了.可是能够依据素数筛的原理.我们先筛出sqrt(2147483647)以内的素数,然后拿这些素数去筛[L,U]之间的素数,即两次素数筛.可是L,U还是非常大,但U-L<=1000000,所以进行区间平移,将[L,U]平移为[0,U-L],就能用数组放得下. #include &…

POJ2689:Prime Distance（大数区间素数筛）

The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is has no prop…

poj 2689 区间素数筛

The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the question of primality. A prime number is a number that is has no prop…