1 files changed, 42 insertions, 0 deletions
diff --git a/codechef/sticks/main.cpp b/codechef/sticks/main.cpp
new file mode 100644
index 0000000..b5fae0e
--- /dev/null
+++ b/codechef/sticks/main.cpp
@@ -0,0 +1,42 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  int tt;
+  cin >> tt;
+  while (tt--) {
+    int n;
+    cin >> n;
+    vector<int> v(n);
+    map<int, int> mp;
+    for (int &x : v) {
+      cin >> x;
+      mp[x]++;
+    }
+    vector<int> pair;
+    set<int> vis;
+    int sq = 0;
+    sort(v.begin(), v.end());
+    for(int i = v.size() - 1; i > 0; i--) {
+      int elem = v[i];
+      if(mp[elem] >= 4) {
+        sq = elem;
+      }
+      if(mp[elem] >= 2 && !vis.count(elem)) {
+        if(pair.size() == 2) {
+          break;
+        }
+        pair.push_back(elem);
+        vis.insert(elem);
+      }
+    }
+    if(pair.size() == 2) {
+      cout << max(pair[0] * pair[1], sq * sq) << endl;
+    } else {
+      cout << -1 << endl;
+    }
+  }
+}