回答編集履歴
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.NET 5未満でも実行できるように変更
answer
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@@ -1,29 +1,29 @@
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LINQを使って次のようにスッキリに出来るかと思います。
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LINQを使って次のようにスッキリに出来るかと思います。
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```csharp
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using System;
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5
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using System.Linq;
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using System.Collections.Generic;
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7
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7
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+
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public class Program
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{
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public static void Main()
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{
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var array1 = new string[,]{ {"a","1"}, {"b", "2"}};
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var array2 = new string[,]{ {"a","
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var array2 = new string[,]{ {"a","3"}, {"c", "3"}};
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foreach(var t in Program.ToTuples(array1).Concat(Program.ToTuples(array2))
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.GroupBy(row => row.Item1)
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.Select(t => (t.Key, t.Sum(row => row.Item2))) ) {
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.Select(t => Tuple.Create(t.Key, t.Sum(row => row.Item2))) ) {
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Console.WriteLine(t.Item1 + " " + t.Item2);
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}
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}
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static IEnumerable<
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static IEnumerable<Tuple<string, int>>ToTuples(string[,] array) {
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for (int i=0; i < array.GetLength(0); i++) {
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yield return (array[i,0], int.Parse(array[i,1]));
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yield return Tuple.Create(array[i,0], int.Parse(array[i,1]));
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}
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}
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-
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+
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}
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```
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