coreBugZJ

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PRIME1 - SPOJ 2. Prime Generator

Peter wants to generate some prime numbers for his cryptosystem. Help him! Your task is to generate all prime numbers between two given numbers!

Input

The input begins with the number t of test cases in a single line (t<=10). In each of the next t lines there are two numbers m and n (1 <= m <= n <= 1000000000, n-m<=100000) separated by a space.

Output

For every test case print all prime numbers p such that m <= p <= n, one number per line, test cases separated by an empty line.

Example

Input:
2
1 10
3 5

Output:
2
3
5
7

3
5
Warning: large Input/Output data, be careful with certain languages (though most should be OK if the algorithm is well designed)



LISP SBCL
可惜 TLE 了。先了解一下语言，以后再优化。



 1(defun primep(n)
 2 (when (< n 2) (return-from primep NIL))
 3 (when (= n 2) (return-from primep T))
 4 (let ((m (floor (sqrt n))) (i 2))
 5  (loop
 6   (when (> i m) (return-from primep T))
 7   (when (zerop (rem n i)) (return-from primep NIL))
 8   (incf i))))
 9
10(defun solve(m n)
11 (do ((p m (1+ p)))
12     ((> p n))
13     (when (primep p) (format t "~d~%" p)))
14 (format t "~%"))
15
16(let ((cnt (parse-integer (read-line)))
17      m n lin)
18 (dotimes (i cnt)
19  (setf lin (read-line))
20  (setf m (parse-integer (subseq lin 0 (position #\Space lin))))
21  (setf n (parse-integer (subseq lin (1+ (position #\Space lin)))))
22  (solve m n)))
23
24


新版本，还是 TLE。

1(defconstant +max-size+ 35000)
2(defvar *prime* (make-array +max-size+ :initial-element t))
3(defvar *prime-size* 0)
4
5(defun init-prime()
6 (do
7 ((i 2 (1+ i)))
8 ((>= i +max-size+))
9 (when (elt *prime* i)
10 (setf (elt *prime* *prime-size*) i)
11 (incf *prime-size*)
12 (do
13 ((j (+ i i) (+ j i)))
14 ((>= j +max-size+))
15 (setf (elt *prime* j) nil)))))
16
17(defun primep(n)
18 (when (< n 2) (return-from primep nil))
19 (when (or (= n 2) (= n 3)) (return-from primep t))
20 (do
21 ((i 0 (1+ i))
22 (p (elt *prime* 0) (elt *prime* (1+ i))))
23 ((or (>= i *prime-size*) (> (* p p) n)) t)
24 (when (zerop (rem n p)) (return-from primep nil))))
25
26(defun solve(m n)
27 (do ((p m (1+ p)))
28 ((> p n))
29 (when (primep p) (format t "~d~%" p)))
30 (format t "~%"))
31
32(init-prime)
33(let ((cnt (parse-integer (read-line)))
34 m n lin)
35 (dotimes (i cnt)
36 (setf lin (read-line))
37 (setf m (parse-integer (subseq lin 0 (position #\Space lin))))
38 (setf n (parse-integer (subseq lin (1+ (position #\Space lin)))))
39 (solve m n)))
40
41

posted on 2012-02-05 17:19 coreBugZJ 阅读(304) 评论(0)  编辑 收藏 引用 所属分类: ACM 、Lisp


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