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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.
![[Swift]LeetCode401. 二进制手表 | Binary Watch](http://code.js-code.com/res/2020/08-06/06/23df7167e20a9a698ac57cb98af66995.jpg "[Swift]LeetCode401. 二进制手表 | Binary Watch")
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:
二进制手表顶部有 4 个 LED 代表小时（0-11），底部的 6 个 LED 代表分钟（0-59）。
每个 LED 代表一个 0 或 1，最低位在右侧。
例如，上面的二进制手表读取 “3:25”。
给定一个非负整数 n 代表当前 LED 亮着的数量，返回所有可能的时间。
案例:
输入: n = 1 返回: ["1:00","0:32"]
注意事项:
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var times:[String] = [String]() @H_675_83@ 4 //轮询遍历 @H_675_83@ 5 for h in 0..<12 @H_675_83@ 6 { @H_675_83@ 7 //将常量转换为变量 @H_675_83@ 8 var hour:Int = h @H_675_83@ 9 for m in 0..<60 @H_675_83@10 { @H_675_83@11 //将常量转换为变量 @H_675_83@12 var minute:Int = m @H_675_83@13 var number:Int = hour*64 + minute @H_675_83@14 if number.bitCount() == num @H_675_83@15 { @H_675_83@16 //minute不足2位前面补0的写法：%02d @H_675_83@17 var str = String(format: "%d:%02d",arguments:[hour,minute]) @H_675_83@18 times.append(str) @H_675_83@19 } @H_675_83@20 } @H_675_83@21 } @H_675_83@22 return times @H_675_83@23 } @H_675_83@24 } @H_675_83@25 //Int扩展代码 @H_675_83@26 extension Int @H_675_83@27 { @H_675_83@28 mutaTing func bitCount() -> Int @H_675_83@29 { @H_675_83@30 self = self - ((self >> 1) & 0x55555555); @H_675_83@31 self = (self & 0x33333333) + ((self >> 2) & 0x33333333); @H_675_83@32 self = (self + (self >> 4)) & 0x0f0f0f0f; @H_675_83@33 self = self + (self >> 8); @H_675_83@34 self = self + (self >> 16); @H_675_83@35 return self & 0x3f; @H_675_83@36 } @H_675_83@37 }
8ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 @H_675_83@ 4 let leds = [1,2,4,8,1,16,32] @H_675_83@ 5 var result = [String]() @H_675_83@ 6 readBinaryWatch(leds,leds.count,0,(leds.count - num),&result) @H_675_83@ 7 return result @H_675_83@ 8 } @H_675_83@ 9 @H_675_83@10 func readBinaryWatch(_ leds: [Int],_ ledsCount: Int,_ left: Int,_ right: Int,_ hours: Int,_ minutes: Int,_ result: inout [String]) { @H_675_83@11 if hours > 11 || minutes > 59 { return } @H_675_83@12 if right >= leds.count { @H_675_83@13 result.append(String(format: "%d:%02d",hours,minutes)) @H_675_83@14 return @H_675_83@15 } @H_675_83@16 @H_675_83@17 for index in left...right { @H_675_83@18 var currentHours = hours @H_675_83@19 var currentminutes = minutes @H_675_83@20 @H_675_83@21 let value = leds[index] @H_675_83@22 if index >= 4 { currentminutes += value } @H_675_83@23 else { currentHours += value } @H_675_83@24 @H_675_83@25 readBinaryWatch(leds,ledsCount,index + 1,right + 1,currentHours,currentminutes,&result) @H_675_83@26 } @H_675_83@27 } @H_675_83@28 @H_675_83@29 }
12ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 let hourArray = [ @H_675_83@ 3 [0],@H_675_83@ 4 [1,8],@H_675_83@ 5 [3,5,6,9,10],@H_675_83@ 6 [7,11] @H_675_83@ 7 ] @H_675_83@ 8 let minArray = [ @H_675_83@ 9 [0],@H_675_83@10 [1,32],@H_675_83@11 [3,10,12,17,18,20,24,33,34,36,40,48],@H_675_83@12 [7,11,13,14,19,21,22,25,26,28,35,37,38,41,42,44,49,50,52,56],@H_675_83@13 [15,23,27,29,30,39,43,45,46,51,53,54,57,58],@H_675_83@14 [31,47,55,59] @H_675_83@15 ] @H_675_83@16 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@17 var result = [String]() @H_675_83@18 @H_675_83@19 for hNum in 0...min(3,num) { @H_675_83@20 let mNum = num - hNum @H_675_83@21 if mNum < minArray.count { @H_675_83@22 for h in hourArraY[hNum] { @H_675_83@23 for m in minArraY[R_37_11845@Num] { @H_675_83@24 result.append("\(h):\(String(format: "%02d",m))") @H_675_83@25 } @H_675_83@26 } @H_675_83@27 } @H_675_83@28 } @H_675_83@29 return result @H_675_83@30 } @H_675_83@31 }
20ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var times: [String] = [] @H_675_83@ 4 let maxClock = num == 1 ? 8 : 11 @H_675_83@ 5 let maxminute = num == 1 ? 32 : 59 @H_675_83@ 6 for clock in 0...maxClock { @H_675_83@ 7 for minute in 0...maxminute { @H_675_83@ 8 if bitCount(clock) + bitCount(minutE) == num { @H_675_83@ 9 let time = String(format: "%d:%02d",clock,minutE) @H_675_83@10 times.append(timE) @H_675_83@11 } @H_675_83@12 } @H_675_83@13 } @H_675_83@14 @H_675_83@15 return times @H_675_83@16 } @H_675_83@17 @H_675_83@18 func bitCount(_ num: int) -> Int { @H_675_83@19 var result = 0 @H_675_83@20 var num2 = num @H_675_83@21 while num2 > 0 { @H_675_83@22 result += num2 & 1 @H_675_83@23 num2 >>= 1 @H_675_83@24 } @H_675_83@25 @H_675_83@26 return result @H_675_83@27 } @H_675_83@28 }
28ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var res = [String]() @H_675_83@ 4 @H_675_83@ 5 func bitCount(_ num: int) -> Int { @H_675_83@ 6 var count = 0 @H_675_83@ 7 var num = num @H_675_83@ 8 while num > 0 { @H_675_83@ 9 count += num & 1 @H_675_83@10 num >>= 1 @H_675_83@11 } @H_675_83@12 return count @H_675_83@13 } @H_675_83@14 @H_675_83@15 for h in 0...11 { @H_675_83@16 for m in 0...59 { @H_675_83@17 if bitCount(h) + bitCount(m) == num { @H_675_83@18 res.append(String(format: "%d:%02d",h,m)) @H_675_83@19 } @H_675_83@20 } @H_675_83@21 } @H_675_83@22 @H_675_83@23 return res @H_675_83@24 } @H_675_83@25 }
48ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var ret: [String] = [] @H_675_83@ 4 @H_675_83@ 5 for i in 0...11 { @H_675_83@ 6 for j in 0...59 { @H_675_83@ 7 let hourBinary = String(i,radix: 2).filter { $0 == "1" } @H_675_83@ 8 let minuteBinary = String(j,radix: 2).filter { $0 == "1" } @H_675_83@ 9 @H_675_83@10 if hourBinary.count + minuteBinary.count == num { @H_675_83@11 ret.append(String(format: "%d:%02d",i,j)) @H_675_83@12 } @H_675_83@13 } @H_675_83@14 } @H_675_83@15 @H_675_83@16 return ret @H_675_83@17 } @H_675_83@18 }
48ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var res = [String]() @H_675_83@ 4 @H_675_83@ 5 func findLEDs(_ h: Int,_ m: int) -> Int { @H_675_83@ 6 let hc = Array(String(h,radix: 2)).filter { $0 == "1" }.count @H_675_83@ 7 let mc = Array(String(m,radix: 2)).filter { $0 == "1" }.count @H_675_83@ 8 return hc + mc @H_675_83@ 9 } @H_675_83@10 @H_675_83@11 for h in 0...11 { @H_675_83@12 for m in 0...59 { @H_675_83@13 if findLEDs(h,m) == num { @H_675_83@14 res.append(String(format: "%d:%02d",m)) @H_675_83@15 } @H_675_83@16 } @H_675_83@17 } @H_675_83@18 @H_675_83@19 return res @H_675_83@20 } @H_675_83@21 }
52ms
@H_675_83@ 1 class Solution { @H_675_83@ 2 func readBinaryWatch(_ num: int) -> [String] { @H_675_83@ 3 var result = [String]() @H_675_83@ 4 @H_675_83@ 5 func findLEDs(_ h: Int,_ m: int) -> Int { @H_675_83@ 6 let hc = Array(String(h,radix: 2).characters).filter { $0 == "1" }.count @H_675_83@ 7 let mc = Array(String(m,radix: 2).characters).filter { $0 == "1" }.count @H_675_83@ 8 return hc + mc @H_675_83@ 9 } @H_675_83@10 for h in 0...11 { @H_675_83@11 for m in 0...59 { @H_675_83@12 if findLEDs(h,m) == num { @H_675_83@13 result.append(String(format: "%d:%02d",m)) @H_675_83@14 } @H_675_83@15 } @H_675_83@16 } @H_675_83@17 return result @H_675_83@18 } @H_675_83@19 }
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