# [LeetCode] Binary Watch 二进制表

A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59).

Each LED represents a zero or one, with the least significant bit on the right.

For example, the above binary watch reads "3:25".

Given a non-negative integer n which represents the number of LEDs that are currently on, return all possible times the watch could represent.

Example:

Input: n = 1
Return: ["1:00", "2:00", "4:00", "8:00", "0:01", "0:02", "0:04", "0:08", "0:16", "0:32"]

Note:

• The order of output does not matter.
• The hour must not contain a leading zero, for example "01:00" is not valid, it should be "1:00".
• The minute must be consist of two digits and may contain a leading zero, for example "10:2" is not valid, it should be "10:02".

https://discuss.leetcode.com/topic/59401/straight-forward-6-line-c-solution-no-need-to-explain

https://discuss.leetcode.com/topic/59494/3ms-java-solution-using-backtracking-and-idea-of-permutation-and-combination/2

LeetCode All in One 题目讲解汇总(持续更新中...)

posted @ 2016-09-22 15:10  Grandyang  阅读(...)  评论(...编辑  收藏