feat: find the 2 missing numbers

Author: assebc

medium/missing_numbers.java

@@ -0,0 +1,12 @@
+import java.util.*;
+
+class Program {
+  public int[] missingNumbers(int[] nums) {
+    Set<Integer> set = new HashSet<>();
+    for(int i = 1; i<= nums.length+2;i++) set.add(i);
+    for(int num:nums) set.remove(num);
+    List<Integer> list = new ArrayList<>(set);
+    return new int[]{list.get(0),list.get(1)};
+  }
+}
+