3-开发共享版APP(搭建指南)-修改手机验证码

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 Given constant integers x and t, write a function that takes no argument and returns true if the function has been called x number of times in last t secs.
Find out all the elements in A and B such that the A[i]B[j]=C[k]
顺时针打印数组，美丽版
 Given a string S, find the longest palindromic substring in S.
很多机器，每台机器上都有很一部分数据，如何输出分布在所有机器上的所有数据的median
C++'s mutable and conceptual constness
上20阶楼梯，可以一次迈1，2，3步，请问有多少种上法？
Count smaller elements on right side in an array.
一排房子，连续填色，成本最低的问题