add funcs to get leaderboard data

src/Main.sol

@@ -60,7 +60,7 @@ contract Main is Owned {
 
     /// Track the number of kills for each address
     mapping(address => uint256) public killCount;
-    /// Index the number of kills to form a basic leaderboard
+    /// Index addresses to form a basic leaderboard
     mapping(uint256 => address) public leaderboard;
     /// Point to the latest leaderboard update
     uint256 public leaderboardPointer;
@@ -176,6 +176,40 @@ contract Main is Owned {
         return mailbomb.bombsExploded();
     }
 
+    /// Get N addresses from the leaderboard
+    /// @param _amount Amount of addresses to return
+    /// @return addresses List of addresses from the top N entries of leaderboard
+    function getLeaderboard(uint256 _amount) public view returns (address[] memory addresses) {
+        address[] memory addressList;
+        uint256 idx;
+        while (addressList.length < _amount) {
+            bool exists;
+            address a = leaderboard[leaderboardPointer - idx];
+            for (uint256 n; n < addressList.length; n++) {
+                if (addressList[n] == a) {
+                    exists = true;
+                }
+            }
+            if (!exists) {
+                addressList[idx] = a;
+                idx++;
+            }
+        }
+        return addressList;
+    }
+
+    /// Get N kill amounts
+    /// @param addresses List of addresses to query kill counts for
+    /// @return amounts List of kill counts for each address in addresses
+    function getKillCounts(address[] memory addresses) public view returns (uint256[] memory amounts) {
+        uint256[] memory _amounts;
+        for (uint256 i; i < addresses.length; i++) {
+            address addr = addresses[i];
+            _amounts[i] = killCount[addr];
+        }
+        return _amounts;
+    }
+
     // =========================================================================
     //                              Tokens
     // =========================================================================