목록백준 (44)

No sweet without sweat

[백준 1181 / 자바(JAVA)] - 단어 정렬

문제의 Key 1. TreeSet O(log n) - null 입력은 가능하지만 한 번만 저장 가능하고 중복X - 오름차순으로 데이터를 정렬합니다. - 내부적으로 TreeMap을 사용 성능 차이 비교 : HashSet > LinkedHashSet > TreeSet ★ Hashset은 stream.sort을 지양하자. - Stream sorted() returns a stream consisting of the elements of this stream, sorted according to natural order. For ordered streams, the sort method is stable but for unordered streams, no stability is guaranteed. - The..
백준 2023. 5. 2. 23:26
[백준 1978 자바/JAVA] 소수찾기

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.StringTokenizer; public class 소수찾기 { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int first = Integer.parseInt(br.readLine()); StringTokenizer st = new StringTokenizer(br...
백준 2023. 3. 21. 23:39
[백준 2501 자바/JAVA] 약수 구하기

package 백준.S20230319; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.StringTokenizer; public class 약수구하기_2501 { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(br.readLine()); int ..
백준 2023. 3. 19. 12:13
[백준 5086 자바/JAVA] 배수와 약

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.StringTokenizer; public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st; StringBuilder sb = new StringBuilder(); while (true) { st = new StringTokenizer(br.readLine()); i..
백준 2023. 3. 13. 17:20
[백준 9506 자바/JAVA] 약수들의 합

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringBuilder sb = new StringBuilder(); while(true){ int num = Integer.parseInt(br.readLine()); if(num==-1) break; int[] arr = new int[num]; int arrInd..
백준 2023. 3. 12. 16:19
[백준 10870 자바/JAVA] 피보나치 수 5

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int num = Integer.parseInt(br.readLine()); System.out.print(fiBonachi(num)); } static int fiBonachi(int num){ if(num==0) return 0; if(num==1) return 1;..
백준 2023. 3. 5. 13:27
[백준 1427 자바/JAVA] 소트인사이트

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays; public class 소트인사이트 { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); long str = Integer.parseInt(br.readLine()); char[] ch = String.valueOf(str).toCharArray(); Arrays.sort(ch); for (int i = ch...
백준 2023. 3. 2. 23:07
[백준 10872 자바/JAVA] 팩토리

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Main { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int num = Integer.parseInt(br.readLine()); int sum = factorial(num); System.out.println(sum); } static int factorial(int num) { if(num 일반적으로 사용X (잘 못 쓰..
백준 2023. 3. 1. 19:36
이전 Prev 1 2 3 4 ··· 6 Next 다음