empty point vector!
size=1, capacity=1
size=2, capacity=2
size=3, capacity=3
size=4, capacity=4
size=5, capacity=6
size=6, capacity=6
size=7, capacity=8
size=8, capacity=8
size=9, capacity=11
size=10, capacity=11
size=11, capacity=11
size=12, capacity=15
size=13, capacity=15
size=14, capacity=15
size=15, capacity=15
size=16, capacity=20
size=17, capacity=20
size=18, capacity=20
size=19, capacity=20
size=20, capacity=20
(0,0)
(19,19)
(0,0)
(1,1)
(2,2)
(3,3)
(4,4)
(5,5)
(6,6)
(7,7)
(8,8)
(9,9)
(10,10)
(11,11)
(12,12)
(13,13)
(14,14)
(15,15)
(16,16)
(17,17)
(18,18)
(19,19)

0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
(100,100)
(0,0)
(1,1)
(2,2)
(3,3)
(4,4)
(5,5)
(6,6)
(7,7)
(8,8)
(9,9)
(10,10)
(11,11)
(12,12)
(13,13)
(14,14)
(15,15)
(16,16)
(17,17)
(18,18)
(19,19)

(100,100)
(0,0)
(1,1)
(2,2)
(3,3)
(4,4)
(5,5)
(6,6)
(7,7)
(8,8)
(10,10)
(11,11)
(12,12)
(13,13)
(14,14)
(15,15)
(16,16)
(17,17)
(18,18)
(19,19)

(0,0)
(2,2)
(4,4)
(6,6)
(8,8)
(10,10)
(12,12)
(14,14)
(16,16)
(18,18)
(20,20)
(22,22)
(24,24)
(26,26)
(28,28)
(30,30)
(32,32)
(34,34)
(36,36)
(38,38)