diff --git a/lastStoneWeight.java b/lastStoneWeight.java
new file mode 100644
index 0000000..85cfe37
--- /dev/null
+++ b/lastStoneWeight.java
@@ -0,0 +1,15 @@
+class Solution {
+    public int lastStoneWeight(int[] stones) {
+        PriorityQueue<Integer> pq= new  PriorityQueue<>(Collections.reverseOrder());
+
+        for(int val:stones) pq.add(val);
+
+        while(pq.size()>1){
+            int y = pq.remove();
+            int x = pq.remove();
+
+            if(x!=y) pq.add(y-x);
+        }
+        return pq.size()>0? pq.remove() : 0;
+    }
+}
diff --git a/sortArray.java b/sortArray.java
new file mode 100644
index 0000000..ff326b9
--- /dev/null
+++ b/sortArray.java
@@ -0,0 +1,13 @@
+class Solution {
+    public int[] sortArray(int[] nums) {
+        PriorityQueue<Integer> pq = new PriorityQueue<>();
+        for(int val:nums){
+            pq.add(val);
+        }
+        int i=0;
+        while(pq.size()>0){
+            nums[i++] = pq.poll();
+        }
+        return nums;
+    }
+}