shamstabrez16
diff --git a/‎.idea/workspace.xml
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+7-8Lines changed: 7 additions & 8 deletions b/‎.idea/workspace.xml
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+7-8Lines changed: 7 additions & 8 deletions
diff --git a/‎src/main/java/org/example/MissingNumber.java
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+33Lines changed: 33 additions & 0 deletions b/‎src/main/java/org/example/MissingNumber.java
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+33Lines changed: 33 additions & 0 deletions
@@ -0,0 +1,33 @@
+package org.example;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class MissingNumber {
+
+    public static int missingNumber(int[] nums) {
+        int n = nums.length;
+        int sum = ( n * (n +1))/2;
+        for(int i=0; i< nums.length; i++){
+           sum = sum - nums[i];
+        }
+        return  sum;
+
+
+//        Set<Integer> set = new HashSet<>();
+//        for(int i=0; i< nums.length; i++){
+//           set.add(nums[i]);
+//        }
+//        for(int i=0; i<= nums.length; i++){
+//            if(!set.contains(i)){
+//                return i;
+//            }
+//        }
+//        return -1;
+    }
+
+    public static void main(String[] args) {
+        int[] nums = {9,6,4,2,3,5,7,0,1};
+        System.out.println(missingNumber(nums));
+    }
+}