Problem:
Convert a1a2a3....anb1b2b3.....bn to
a1b1a2b2a3b3.....anbn
in O(n) time and O(1) space
Solution:
Complexity: O(n) time O(1) space
Code:
Convert a1a2a3....anb1b2b3.....bn to
a1b1a2b2a3b3.....anbn
in O(n) time and O(1) space
Solution:
[b]       a b c d e 1 2 3 4 5      [2<=5, index=2*2-1=3]
[c]       a b b d e 1 2 3 4 5      [3<=5, index=3*2-1=5]
[e]       a b b d c 1 2 3 4 5      [5<=5, index=5*2-1=9]
[4]       a b b d c 1 2 3 e 5      [9>5, index=(9-5)*2=8]
[3]       a b b d c 1 2 4 e 5      [8>5, index=(8-5)*2=6]
[1]       a b b d c 3 2 4 e 5      [6>5, index=(6-5)*2=2]
[b]       a 1 b d c 3 2 4 e 5      [startindex=index=2]
[d]       a 1 b d c 3 2 4 e 5      [4<=5,index=4*2-1=7]
[2]       a 1 b d c 3 d 4 e 5      [7>5,index=(7-5)*2=4]
[d]       a 1 b 2 c 3 d 4 e 5      [startindex=index=4]
Complexity: O(n) time O(1) space
Code:
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