/
githubmirror
/
interviews
Обзор
Документация
Войти
/
githubmirror
/
interviews
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
company/google/BinaryWatch.java
35 строк
1 KB
Kevin Naughton Jr
finish renaming files and directories
27 мар 2018, 19:52
27 мар 2018, 19:52
ec6dfb5
Код
Авторство
О чём код?
// 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". public class BinaryWatch { public List<String> readBinaryWatch(int num) { ArrayList<String> allTimes = new ArrayList<String>(); //iterate through all possible time combinations for(int i = 0; i < 12; i++) { for(int j = 0; j < 60; j++) { //if the current number and n have the same number of bits the time is possible if(Integer.bitCount(i * 64 + j) == num) { //add the current time to all times arraylist allTimes.add(String.format("%d:%02d", i, j)); } } } return allTimes; } }