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def twoSum(nums, target):
    seen = {}
    for i, v in enumerate(nums):
        remaining = target - v
        if remaining in seen:
            yield [seen[remaining], i]
        seen[v] = i
    return []

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def twosum(nums, target):
    c = 0
    for i, v in enumerate(nums[:-1]):
        diff = target - v
        if diff in nums[i+1:]:
            yield (v, diff)
            c += 1
    return c