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nums = 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| |
cache = collections.defaultdict(list) | |
result = set() | |
def cachebuild(): | |
for a in xrange(len(nums)): | |
for b in xrange(a+1,len(nums)): | |
cache[nums[a]+nums[b]] += [(a,b)] | |
def resultbuild(): | |
prev = '' | |
for (index,c) in enumerate(nums): | |
if c == prev: | |
continue | |
else: | |
prev = c | |
remainder = -c | |
if remainder in cache: | |
for (a,b) in cache[remainder]: | |
if a != index and b != index: | |
solution = tuple(sorted([nums[a],nums[b],c])) | |
if solution not in result: | |
result.add(solution) | |
return result | |
def threesum(): | |
nums.sort() | |
cachebuild() | |
return resultbuild() | |
profile.run('threesum()') |
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