LeetCode 167. Two Sum II — Input array is sorted

題目:

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.

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LeetCode 172. Factorial Trailing Zeroes

題目:

計算階層算出來的數值後面有幾個0。

Given an integer n, return the number of trailing zeroes in n!.

Follow up: Could you write a solution that works in logarithmic time complexity?

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Relationships are like french fries

LeetCode 168. Excel Sheet Column Title

題目:

數字轉字母，26進制。

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

1 -> A
    2 -> B
    3 -> C
    …

LeetCode 171. Excel Sheet Column Number

題目:

26進位轉換成10進位。

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

A -> 1
    B -> 2
    C -> 3
    …

LeetCode 169. Majority Element

題目:

return 出現最多次的element，出現次數最多次就是超過n/2次。

Given an array nums of size n, return the majority element.

The majority element is the element that appears more than ⌊n / 2⌋ times. You may assume that…