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+# 401. Binary Watch
+
+"""
+a binary watch has 4 leds on the top to represent the hours (0 - 11) and 6
+leds on the bottom to represent the minutes (0 - 59). each led represents a 0
+or one, with the least siginificant bit on the right. given an integer
+'turnedOn' which represents the number of leds that are currently on, return
+all possible times the watch could represent. you may return the answer in
+any order.
+"""
+
+
+class Solution(object):
+ def readBinaryWatch(self, turnedOn):
+ """
+ :type turnedOn: int
+ :rtype: List[str]
+ """
+ return [
+ "%d:%02d" % (h, m)
+ for h in range(12)
+ for m in range(60)
+ if (bin(h) + bin(m)).count("1") == turnedOn
+ ]
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.readBinaryWatch(turnedOn=1))
+ print(obj.readBinaryWatch(turnedOn=9))