Arithmetic Progressions
#描述#
An arithmetic progression is a sequence of the form a, a+b, a+2b, ..., a+nb where n=0,1,2,3,... . For this problem, a is a non-negative integer and b is a positive integer.
Write a program that finds all arithmetic progressions of length n in the set S of bisquares. The set of bisquares is defined as the set of all integers of the form p2 + q2 (where p and q are non-negative integers).
#格式#
##输入格式##
There are more than one cases:
Line 1: N (3 <= N <= 25), the length of progressions for which to search .
Line 2: M (1 <= M <= 250), an upper bound to limit the search to the bisquares with 0 <= p,q <= M.
N=0 and M=0 means the end of input.
##输出格式##
If no sequence is found, a singe line reading `NONE'. Otherwise, output one or more lines, each with two integers: the first element in a found sequence and the difference between consecutive elements in the same sequence. The lines should be ordered with smallest-difference sequences first and smallest starting number within those sequences first.
There will be no more than 10,000 sequences.
ATTION! There is NO blank line after each case!
#样例1#
##样例输入1##
5
7
##样例输出1##
1 4
37 4
2 8
29 8
1 12
5 12
13 12
17 12
5 20
2 24
#限制#
5000ms
32768KB
#提示#
#来源#