取N<=30, 上面的程序输出结果为:
(1,2,3,3)
(1,4,5,5)
(1,6,7,7)
(1,8,9,9)
(1,10,11,11)
(1,12,13,13)
(1,14,15,15)
(1,16,17,17)
(1,18,19,19)
(1,20,21,21)
(1,22,23,23)
(1,24,25,25)
(1,26,27,27)
(1,28,29,29)
(2,4,6,6)
(2,5,7,7)
(2,8,10,10)
(2,9,11,11)
(2,12,14,14)
(2,13,15,15)
(2,16,18,18)
(2,17,19,19)
(2,20,22,22)
(2,21,23,23)
(2,24,26,26)
(2,25,27,27)
(2,28,30,30)
(3,4,7,7)
(3,5,6,7)
(3,8,11,11)
(3,9,10,11)
(3,12,15,15)
(3,13,14,15)
(3,16,19,19)
(3,17,18,19)
(3,20,23,23)
(3,21,22,23)
(3,24,27,27)
(3,25,26,27)
(4,8,12,12)
(4,9,13,13)
(4,10,14,14)
(4,11,15,15)
(4,16,20,20)
(4,17,21,21)
(4,18,22,22)
(4,19,23,23)
(4,24,28,28)
(4,25,29,29)
(4,26,30,30)
(5,8,13,13)
(5,9,12,13)
(5,10,15,15)
(5,11,14,15)
(5,16,21,21)
(5,17,20,21)
(5,18,23,23)
(5,19,22,23)
(5,24,29,29)
(5,25,28,29)
(6,8,14,14)
(6,9,15,15)
(6,10,12,14)
(6,11,13,15)
(6,16,22,22)
(6,17,23,23)
(6,18,20,22)
(6,19,21,23)
(6,24,30,30)
(6,26,28,30)
(7,8,15,15)
(7,9,14,15)
(7,10,13,15)
(7,11,12,15)
(7,11,13,14)
(7,16,23,23)
(7,17,22,23)
(7,18,21,23)
(7,19,20,23)
(7,19,21,22)
(7,27,29,30)
(8,16,24,24)
(8,17,25,25)
(8,18,26,26)
(8,19,27,27)
(8,20,28,28)
(8,21,29,29)
(8,22,30,30)
(9,16,25,25)
(9,17,24,25)
(9,18,27,27)
(9,19,26,27)
(9,20,29,29)
(9,21,28,29)
(10,16,26,26)
(10,17,27,27)
(10,18,24,26)
(10,19,25,27)
(10,20,30,30)
(10,22,28,30)
(11,16,27,27)
(11,17,26,27)
(11,18,25,27)
(11,19,24,27)
(11,19,25,26)
(11,23,29,30)
(12,16,28,28)
(12,17,29,29)
(12,18,30,30)
(12,20,24,28)
(12,21,25,29)
(12,22,26,30)
(13,16,29,29)
(13,17,28,29)
(13,20,25,29)
(13,21,24,29)
(13,21,25,28)
(13,23,27,30)
(14,16,30,30)
(14,18,28,30)
(14,20,26,30)
(14,22,24,30)
(14,22,26,28)
(14,23,27,29)
(15,19,29,30)
(15,21,27,30)
(15,22,27,29)
(15,23,25,30)
(15,23,26,29)
(15,23,27,28)
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