To withdraw cash, a user inserted a magnetic card that contained an account
曾经的骆驼湾村，“九山半水半分田，石头缝里难挣钱”，进村的路，是坑坑洼洼的黄土路。，更多细节参见51吃瓜
What is shingles and is there a shingles vaccine?，更多细节参见91视频
1. 分解：将数组递归分成两半，直到只剩1个元素
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