diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f68d109
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,29 @@
+### 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
\ No newline at end of file
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..ea7ed09
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..47d13e9
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..a3c5be8
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..46ab8e6
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,7 @@
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/HW1.iml b/HW1.iml
new file mode 100644
index 0000000..9465dd8
--- /dev/null
+++ b/HW1.iml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/src/EvenSum.java b/src/EvenSum.java
new file mode 100644
index 0000000..5840b2e
--- /dev/null
+++ b/src/EvenSum.java
@@ -0,0 +1,25 @@
+import java.util.Scanner;
+import java.util.ArrayList;
+public class EvenSum {
+ public static void main(String[] args) {
+
+ }
+
+ public static int Even_sum(ArrayList a) {
+
+ int sum = 0;
+ for (int i = 0; i <= a.size(); i += 2) sum += a.get(i);
+ return sum;
+ }
+ public static ArrayList primefactor(int a) {
+
+ ArrayList pf = new ArrayList();
+ for (int i = 2; i < a/2; i++ )
+ if(a%i==0){
+ pf.add(i);
+ a/=i;
+ }
+ return pf;
+ }
+
+}
diff --git a/src/Factorial.java b/src/Factorial.java
new file mode 100644
index 0000000..78d7ffb
--- /dev/null
+++ b/src/Factorial.java
@@ -0,0 +1,26 @@
+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
+ */
+ }
+
+
+}
diff --git a/src/Fibobin.java b/src/Fibobin.java
new file mode 100644
index 0000000..f9cbe44
--- /dev/null
+++ b/src/Fibobin.java
@@ -0,0 +1,30 @@
+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(nRun code, press or
+// click the icon in the gutter.
+public class HelloWorld {
+ public static void main(String[] args) {
+ System.out.println("Hello, World!");
+ }
+}
\ No newline at end of file
diff --git a/src/Palindrome.java b/src/Palindrome.java
new file mode 100644
index 0000000..3da37b2
--- /dev/null
+++ b/src/Palindrome.java
@@ -0,0 +1,15 @@
+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");
+ }
+}
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