Create 268.Missing_Number.java

Author: kishanrajput23

268.Missing_Number.java

@@ -0,0 +1,10 @@
+class Solution {
+    public int missingNumber(int[] nums) {
+        int n = nums.length;
+        int sum = (n * (n+1)) / 2;
+        for(int i=0; i<n; i++) {
+            sum -= nums[i];
+        }
+        return sum;
+    }
+}