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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. class Program
  6. {
  7.     class Applicant
  8.     {
  9.         public int SchoolNumber { get; set; }
  10.         public int Year { get; set; }
  11.         public string LastName { get; set; }
  12.     }
  13.  
  14.     static void Main()
  15.     {
  16.         List<Applicant> applicants = new List<Applicant>
  17.         {
  18.             new Applicant { SchoolNumber = 101, Year = 2020, LastName = "Smith" },
  19.             new Applicant { SchoolNumber = 56, Year = 2020, LastName = "Johnson" },
  20.             new Applicant { SchoolNumber = 78, Year = 2021, LastName = "Williams" },
  21.             new Applicant { SchoolNumber = 90, Year = 2021, LastName = "Jones" },
  22.             new Applicant { SchoolNumber = 110, Year = 2022, LastName = "Brown" },
  23.             new Applicant { SchoolNumber = 95, Year = 2022, LastName = "Davis" }
  24.         };
  25.  
  26.         var result = applicants.GroupBy(a => a.Year) // Группируем по году
  27.                                .OrderBy(g => g.Key) // Сортируем по году
  28.                                .Select(g => $"{g.Key}: {g.Max(a => a.SchoolNumber)}") // Ищем школу с макс. номером
  29.                                .ToList();
  30.  
  31.         Console.WriteLine(string.Join("\n", result));
  32.     }
  33. }
Success #stdin #stdout 0.07s 30580KB
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stdin
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Standard input is empty
stdout
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2020: 101
2021: 90
2022: 110
https://ideone.com/Wkn5j3
language:
C# (NET 6.0)
created:
39 days ago
visibility:
public

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