🚚 rename pkg and add <Fold an array>.

java/BitCounting.java → javasolutions/BitCounting.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName BitCounting

java/CountingDuplicates.java → javasolutions/CountingDuplicates.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 import java.util.HashMap;
 import java.util.Map;

java/FindUniq.java → javasolutions/FindUniq.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName FindUniq

javasolutions/FoldArray.java

@@ -0,0 +1,38 @@
+package javasolutions;
+
+import java.util.Arrays;
+
+/**
+ * @ClassName FoldArray
+ * @Description: ref: https://www.codewars.com/kata/57ea70aa5500adfe8a000110/train/java
+ * @Author gravel
+ * @Date 2020/1/21
+ * @Version V1.0
+ **/
+public class FoldArray {
+    public static int[] foldArray(int[] array, int runs) {
+        if (array == null || array.length < 2) return array;
+        if (runs == 0) return array;
+        int l = 0;
+        int r = array.length - 1;
+        int len = array.length;
+        int[] copyArr = Arrays.copyOf(array,len);
+        while (runs > 0) {
+            while (l < r) {
+                copyArr[l] = copyArr[l] + copyArr[r];
+                l++;
+                r--;
+            }
+            double c = ((double) len) / 2;
+            len = (int) Math.ceil(c);
+            runs--;
+            l = 0;
+            r = len - 1;
+        }
+        return Arrays.copyOf(copyArr, len);
+    }
+
+    public static void main(String[] args) {
+        System.out.println(Arrays.toString(foldArray(new int[]{1, 2, 3, 4, 5}, 3)));
+    }
+}

java/Multiples3or5.java → javasolutions/Multiples3or5.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName Multiples3or5

java/Multiply.java → javasolutions/Multiply.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName Multiply

java/SortArray.java → javasolutions/SortArray.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName SortArray

java/Square.java → javasolutions/Square.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName Square

java/TwoSum.java → javasolutions/TwoSum.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 import java.util.HashMap;
 import java.util.Map;

java/ValidatePin.java → javasolutions/ValidatePin.java

@@ -1,4 +1,4 @@
-package java;
+package javasolutions;
 
 /**
  * @ClassName ValidatePin