加起来和为目标值的组合

def solve(____):
    nums = sorted(map(int, str(____).split(____)))
    target = int(____)
    result = []
    def bt(____):
        if remain == ____:
            result.append(____)
            return
        for i in range(start, len(____)):
            if nums[i] > remain: break
            path.append(____)
            bt(____)
            path.pop()
    bt(____, [], target)
    for r in result:
        print('____'.join(map(____)))