题解 | 合并表记录

public class Program {
    public static void Main() {
        string line = System.Console.ReadLine ();
        var count = int.Parse(line);
        var lit= new System.Collections.Generic.List<int>();
        var dic = new System.Collections.Generic.Dictionary<int, int>();
        for (var ix = 0; ix < count; ix++) {
            line = System.Console.ReadLine();
            var splits = line.Split(' ');
            var index = int.Parse(splits[0]);
            var val = int.Parse(splits[1]);
            
            if (dic.TryGetValue(index, out var valNow)) {
                dic[index] = valNow + val;
            }else{
                dic[index] = val;
                lit.Add(index);
            }
        }
        lit.Sort((v1, v2)=>{
            return v1 - v2;
        });
        foreach(var index in lit)
            System.Console.WriteLine(index + " " + dic[index]);

    }
}