[1.已知一个数组中的值，在另外一个数组中查找该值](%E4%B8%80%E7%9B%B4%E4%B8%80%E4%B8%AA%E6%95%B0%E7%BB%84%E4%B8%AD%E7%9A%84%E5%80%BC%EF%BC%8C%E5%9C%A8%E5%8F%A6%E5%A4%96%E4%B8%80%E4%B8%AA%E6%95%B0%E7%BB%84%E4%B8%AD%E6%9F%A5%E6%89%BE%E8%AF%A5%E5%80%BC.md) [累加器](%E7%B4%AF%E5%8A%A0%E5%99%A8.md) [数组随机](%E6%95%B0%E7%BB%84%E9%9A%8F%E6%9C%BA.md) [数组扁平化并去重排序](%E6%95%B0%E7%BB%84%E6%89%81%E5%B9%B3%E5%8C%96%E5%B9%B6%E5%8E%BB%E9%87%8D.md)