题目： 找出下一个完全平方数
描述： You might know some pretty large perfect squares. But what about the NEXT one?
Complete the findNextSquare method that finds the next integral perfect square after the one passed as a parameter. Recall that an integral perfect square is an integer n such that sqrt(n) is also an integer.
If the argument is itself not a perfect square then return either -1 or an empty value like None or null, depending on your language. You may assume the argument is non-negative.
Examples ( Input --> Output )
121 --> 144
625 --> 676
114 --> -1 # because 114 is not a perfect square
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题目： 判断有效的 PIN 字符串
描述： ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits.
If the function is passed a valid PIN string, return true, else return false.
Examples (Input --> Output)
"1234" --> true
"12345" --> false
"a234" --> false
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题目： 找出数组中出现奇数次数的数字
描述： Given an array of integers, find the one that appears an odd number of times. There will always be only one integer that appears an odd number of times. Examples [7] should return 7, because it occurs 1 time (which is odd). [0] should return 0, because it occurs 1 time (which is odd). [1,1,2] should return 2, because it occurs 1 time (which is odd). [0,1,0,1,0] should return 0, because it occurs 3 times (which is odd). [1,2,2,3,3,3,4,3,3,3,2,2,1] should return 4, because it appears 1 time (which is odd).
在线地址：Find the odd int
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