// 2026년 포트폴리오용 재구성 코드. 실제 업무 당시 소스가 아닙니다.
// 2026 portfolio reconstruction. Not original production source. In-memory model; persistence is a separate adapter.
using System;
using System.Collections.Generic;
namespace PortfolioExamples
{
    public sealed class LocalLeaderboard
    {
        readonly Dictionary<string, int> best = new Dictionary<string, int>();
        public void Submit(string player, int score)
        {
            if (string.IsNullOrWhiteSpace(player) || score < 0) throw new ArgumentException("Invalid score entry.");
            if (!best.TryGetValue(player, out int previous) || score > previous) best[player] = score;
        }
        public List<KeyValuePair<string, int>> Top(int count)
        {
            if (count < 0) throw new ArgumentOutOfRangeException(nameof(count));
            var rows = new List<KeyValuePair<string, int>>(best);
            rows.Sort((a,b) => a.Value != b.Value ? b.Value.CompareTo(a.Value) : StringComparer.Ordinal.Compare(a.Key,b.Key));
            return rows.GetRange(0, Math.Min(count, rows.Count));
        }
    }
}