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Commit4b025fe

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‎ruby/15-3Sum.rb‎

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defthree_sum(nums)
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sums=[]
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nums.sort!# This is to get rid of duplicate solutions
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nums.each_with_indexdo |num,idx|
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nextifidx.positive? &&num ==nums[idx -1]
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left=idx +1
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right=nums.length -1
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whileleft <right
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casenum +nums[left] +nums[right] <=>0
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when1
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right -=1
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when0
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sums <<[num,nums[left],nums[right]]
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left +=1
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left +=1whilenums[left] ==nums[left -1] &&left <right
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when -1
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left +=1
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end
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end
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end
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sums
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end

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