三数之和

def solve(____):
    nums = list(map(int, nums.split(____)))
    nums.sort()
    result = []
    for i in range(len(____) - ____):
        if i > ____ and nums[i] == nums[i - ____]:
            continue
        left, right = i + ____, len(____) - ____
        while left < right:
            total = nums[i] + nums[left] + nums[right]
            if total == ____:
                result.append(____)
                while left < right and nums[left] == nums[left + ____]:
                    left += ____
                while left < right and nums[right] == nums[right - ____]:
                    right -= ____
                left += ____
                right -= ____
            elif total < ____:
                left += ____
            else:
                right -= ____
    for r in result:
        print('____'.join(map(____)))