[LeetCode&Python] Problem 401. Binary Watch
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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".
class Solution(object): def readBinaryWatch(self, num): """ :type num: int :rtype: List[str] """ ans=[] def findans(leds,bits=0,i=0): if bits==num: h,m=int(‘‘.join(leds[:4]),2), int(‘‘.join(leds[4:]),2) if h<12 and m<60: ans.append("{}:{:02d}".format(h,m)) return for j in range(i,10): leds[j]=‘1‘ findans(leds,bits+1,j+1) leds[j]=‘0‘ findans([‘0‘]*10) return ans
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