Python 刷Leetcode题库，顺带学英语单词（41）

Factorial Trailing Zeroes

Given an integer n, return the number of trailing zeroes in n!.    [#172]

    Examples:
    Input: 3
    Output: 0
    Explanation: 3! = 6, no trailing zero.
    Input: 5
    Output: 1
    Explanation: 5! = 120, one trailing zero.

Note: Your solution should be in logarithmic time complexity.

Largest Number

Given a list of non negative integers, arrange them such that they form the largest number.    [#179]

Examples:
    Input: [10,2]
    Output: "210"
    Input: [3,30,34,5,9]
    Output: "9534330"

Note:

The result may be very large, so you need to return a string instead of an integer.

Repeated DNA Sequences

All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for Example:

"ACGAATTCCG". When studying DNA, it is sometimes useful to identify repeated sequences within the DNA.    [#187]

Write a function to find all the 10-letter-long sequences (substrings) that occur more than once in a DNA molecule.

   Example:

Input: s = "AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT"
    Output: ["AAAAACCCCC", "CCCCCAAAAA"]