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Photograph: Julian Chokkattu
她从一开始就没对市场抱太高期待，只是想找一件让自己开心的事做，她想：“哪怕失败，就当理财又暴雷一次，没关系。”
优势：时间复杂度O(d*(n+k))，d为位数，适合位数少的整数