add 3637 mod + tests

java/search/IntList.java

@@ -12,6 +12,10 @@ public class IntList {
 
     public IntList() {}
 
+    public IntList(int[] list) {
+        this.list = list;
+    }
+
     public void put(int val) {
         if (idx >= list.length) {
             list = Arrays.copyOf(list, list.length * 2);
@@ -24,6 +28,16 @@ public class IntList {
         return idx;
     }
 
+    public IntList getReversed() {
+        IntList reverse = new IntList(new int[idx]);
+
+        for (int i = idx - 1; i >= 0; i--) {
+            reverse.put(list[i]);
+        }
+
+        return reverse;
+    }
+
     public int get(int index) {
         return list[index];
     }