feat: 기초 알고리즘 문제 풀이

feat: 기초 알고리즘 문제 풀이

baekjoon/src/main/java/baekjoon/basic/functions/검증수.java

@@ -0,0 +1,21 @@
+package baekjoon.basic.functions;
+
+import java.util.Scanner;
+
+public class 검증수 {
+   public static void main(String[] args) {
+      Scanner sc = new Scanner(System.in);
+
+      int result = 0;
+
+      for (int i = 0; i < 5; i++) {
+         int number = sc.nextInt();
+
+         result = result + (number * number);
+      }
+
+      System.out.println(result % 10);
+
+      sc.close();
+   }
+}

baekjoon/src/main/java/baekjoon/basic/functions/이상한기호.java

@@ -0,0 +1,12 @@
+package baekjoon.basic.functions;
+
+import java.util.Scanner;
+
+public class 이상한기호 {
+   public static void main(String[] args) {
+      Scanner sc = new Scanner(System.in);
+      long a = sc.nextLong();
+      long b = sc.nextLong();
+      System.out.println((a+b)*(a-b));
+   }
+}

baekjoon/src/main/java/baekjoon/basic/strings/그대로출력하기.java

@@ -0,0 +1,14 @@
+package baekjoon.basic.strings;
+
+import java.util.Scanner;
+
+public class 그대로출력하기 {
+   public static void main(String[] args) {
+      try(Scanner sc = new Scanner(System.in)) {
+
+         while (sc.hasNext()) {
+            System.out.println(sc.nextLine());
+         }
+      }
+   }
+}

baekjoon/src/main/java/baekjoon/basic/strings/단어길이재기.java

@@ -0,0 +1,13 @@
+package baekjoon.basic.strings;
+
+import java.util.Scanner;
+
+public class 단어길이재기 {
+   public static void main(String[] args) {
+      try(Scanner sc = new Scanner(System.in)) {
+         String a = sc.next();
+
+         System.out.println(a.length());
+      }
+   }
+}

baekjoon/src/main/java/baekjoon/basic/strings/대소문자바꾸기.java

@@ -0,0 +1,30 @@
+package baekjoon.basic.strings;
+
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.util.Scanner;
+
+public class 대소문자바꾸기 {
+   public static void main(String[] args) {
+      try(Scanner sc = new Scanner(System.in);
+          BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));) {
+         String a = sc.next();
+         char[] string = a.toCharArray();
+
+         for (int i = 0; i < string.length; i++) {
+            char ch = string[i];
+            if (Character.isUpperCase(ch)) { // 대문자라면
+               bw.write(Character.toLowerCase(ch));
+            } else { // 소문자라면
+               bw.write(Character.toUpperCase(ch));
+            }
+         }
+
+         bw.flush();
+
+      } catch (IOException e) {
+         e.printStackTrace();
+      }
+   }
+}

baekjoon/src/main/java/baekjoon/basic/strings/문자열.java

@@ -0,0 +1,20 @@
+package baekjoon.basic.strings;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class 문자열 {
+   public static void main(String[] args) {
+      try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
+         int n = Integer.parseInt(br.readLine());
+
+         for (int i = 0; i < n; i++) {
+            char[] a = br.readLine().toCharArray();
+            System.out.println(a[0] + "" +  a[a.length - 1]);
+         }
+      } catch (IOException e) {
+         e.printStackTrace();
+      }
+   }
+}

baekjoon/src/main/java/baekjoon/basic/strings/학점계산.java

@@ -0,0 +1,48 @@
+package baekjoon.basic.strings;
+
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.util.Scanner;
+
+public class 학점계산 {
+   public static void main(String[] args) {
+      try(Scanner sc = new Scanner(System.in);
+          BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));) {
+         String a = sc.next();
+
+         if (a.equals("A+")) {
+            bw.write("4.3");
+         } else if (a.equals("A0")) {
+            bw.write("4.0");
+         } else if (a.equals("A-")) {
+            bw.write("3.7");
+         } else if (a.equals("B+")) {
+            bw.write("3.3");
+         } else if (a.equals("B0")) {
+            bw.write("3.0");
+         } else if (a.equals("B-")) {
+            bw.write("2.7");
+         } else if (a.equals("C+")) {
+            bw.write("2.3");
+         } else if (a.equals("C0")) {
+            bw.write("2.0");
+         } else if (a.equals("C-")) {
+            bw.write("1.7");
+         } else if (a.equals("D+")) {
+            bw.write("1.3");
+         } else if (a.equals("D0")) {
+            bw.write("1.0");
+         } else if (a.equals("D-")) {
+            bw.write("0.7");
+         } else {
+            bw.write("0.0");
+         }
+
+         bw.flush();
+
+      } catch (IOException e) {
+         e.printStackTrace();
+      }
+   }
+}