Optimized solution 3、39

[halfrost]

No description provided.

[codecov-commenter]

Codecov Report

Merging #45 into master will decrease coverage by 0.08%.
The diff coverage is 23.52%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
- Coverage   73.34%   73.26%   -0.09%     
==========================================
  Files         519      519              
  Lines       11762    11777      +15     
==========================================
+ Hits         8627     8628       +1     
- Misses       2874     2888      +14     
  Partials      261      261              

Impacted Files	Coverage Δ
... Longest Substring Without Repeating Characters.go	56.25% <13.33%> (-43.75%)	⬇️
...etcode/0039.Combination-Sum/39. Combination Sum.go	90.00% <100.00%> (+1.11%)	⬆️

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