[2, 5, 1, 1, 3]
2
adding
j = 1
t = 2
i = 0
adding
j = 2
t = 2
i = 0
0
2
adding
j = 1
t = 1
i = 2
adding
j = 2
t = 1
i = 2
1
adding
j = 1
t = 1
i = 3
0
[1, 1, 2, 2, 4]