Python iterator solution


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    L
    class Solution(object):
        def combinationSum(self, candidates, target):
            """
            :type candidates: List[int]
            :type target: int
            :rtype: List[List[int]]
            """
            def combs(c, t):
                if t == 0:
                    yield []
                elif t > 0 and c:
                    for tail in combs(c, t - c[0]):
                        yield [c[0]] + tail
                    for comb in combs(c[1:], t):
                        yield comb
            return list(combs(candidates, target))
    

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