From ec957d224610d5efb322ecadebbf0ee02fbc30bb Mon Sep 17 00:00:00 2001
From: AbhiYMCA <33192574+AbhiYMCA@users.noreply.github.com>
Date: Sun, 29 Oct 2017 12:07:25 +0530
Subject: [PATCH] Create mex

---
 mex | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 mex

diff --git a/mex b/mex
new file mode 100644
index 0000000..067e7ea
--- /dev/null
+++ b/mex
@@ -0,0 +1,27 @@
+#include<bits/stdc++.h>
+using namespace std;
+int main()
+{
+    ios_base::sync_with_stdio(false);
+    long int t;
+    cin>>t;
+    while(t--)
+    {
+        long long int n,k,i=0;
+        cin>>n>>k;
+        long long int num,h[200005]={0};
+        for(i=0;i<n;i++)
+        {
+            cin>>num;
+            h[num]++;
+        }
+        i=0;
+        while(k>=0)
+        {
+            if(!h[i])
+                k--;
+                i++;
+        }
+        cout<<i-1<<"\n";
+    }
+}