first HW

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="23" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/HW1.iml" filepath="$PROJECT_DIR$/HW1.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/Hw1" vcs="Git" />
+  </component>
+</project>

HW1.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/EvenSum.java

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+import java.util.Scanner;
+import java.util.ArrayList;
+public class EvenSum {
+    public static void main(String[] args) {
+
+    }
+
+    public static int Even_sum(ArrayList<Integer> a) {
+
+        int sum = 0;
+        for (int i = 0; i <= a.size(); i += 2) sum += a.get(i);
+        return sum;
+    }
+    public static ArrayList<Integer> primefactor(int a) {
+
+        ArrayList<Integer> pf = new ArrayList<Integer>();
+        for (int i = 2; i < a/2; i++ )
+            if(a%i==0){
+                pf.add(i);
+                a/=i;
+            }
+        return pf;
+    }
+
+}

src/Factorial.java

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+public class Factorial {
+    public static void main(String[] args) {
+        int a = 3,b=6;
+        reco2(a);
+
+    }
+    public static int factorial(int a){
+        /*
+        if (a!=int){
+            throw exception;
+        }
+
+         */
+        else {
+           if (a==1||a==0)
+               return 1;
+           return a*factorial(a-1);
+        }
+        /*
+        when n is bigger than max stack:
+        use normal algo
+        */
+    }
+
+
+}

src/Fibobin.java

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+public class Fibobin {
+    public static void main(String[] args) {
+
+    }
+    public static int fib(int i){
+        int[] a = {1,1};
+        if(i==1||i==2)
+            return 1;
+        for(int j=3;j<=i;j++){
+            int temp =  a[1];
+            a[1] = a[0]+a[1];
+            a[0] = temp;
+        }
+        return a[1];
+    }
+    public static short bin(int i){
+        if(i==0)return 0;
+        if(i==1)return 1;
+        return (short)(bin(i/2)+i%2);
+    }
+    public static boolean fibobin(int n){
+        int i = 1;
+        while(true){
+        int z = fib(i)+bin(fib(i));
+        if(n==z)return true;
+        if(n<z)return false;
+        i++;
+        }
+    }
+}

src/HelloWorld.java

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+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}

src/Palindrome.java

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+import java.util.Scanner;
+public class Palindrome {
+    public static void main(String[] args) {
+
+    }
+
+    public static void palindrome() {
+        Scanner s = new Scanner(System.in);
+        String input = s.next();
+
+        for(int i = 0; i < input.length()/2-1; i++) {
+            if(input.charAt(i)!=input.charAt(input.length()-i-1)) System.out.println("riddy");return;}
+        System.out.println("palindrome");
+    }
+}