水

记录一下序列即可

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _2A
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            IDictionary<string, List<Tuple<int, int>>> score = new Dictionary<string, List<Tuple<int, int>>>();

            for (int i = 0; i < n; i++)
            {
                string[] tmp = Console.ReadLine().Split();
                int s = int.Parse(tmp[1]);
                if (!score.Keys.Contains(tmp[0]))
                {
                    score.Add(new KeyValuePair<string, List<Tuple<int, int>>>(tmp[0], new List<Tuple<int, int>>()));
                }
                else
                {
                    s += score[tmp[0]].Last().Item1;
                }
                score[tmp[0]].Add(new Tuple<int, int>(s, i));
            }
            List<string> names = new List<string>();
            int finalScore = 0;
            foreach (var item in score)
            {
                if (names.Count == 0)
                {
                    names.Add(item.Key);
                    finalScore = item.Value.Last().Item1;
                }
                else
                {
                    if (item.Value.Last().Item1 > finalScore)
                    {
                        names.Clear();
                        names.Add(item.Key);
                        finalScore = item.Value.Last().Item1;
                    }
                    else if (item.Value.Last().Item1 == finalScore)
                    {
                        names.Add(item.Key);
                    }
                }
            }

            string maxName = "";
            if (names.Count > 1)
            {
                int earliestRound = 99999;
                foreach (var name in names)
                {
                    for (int i = 0; i < score[name].Count; i++)
                    {
                        if (score[name][i].Item1 >= finalScore && score[name][i].Item2 < earliestRound)
                        {
                            maxName = name;
                            earliestRound = score[name][i].Item2;
                            break;
                        }
                    }
                }
            }
            else
            {
                maxName = names[0];
            }

            Console.WriteLine(maxName);
        }
    }
}