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Excel列名変換問題で第2回社内プログラミングコンテストを開催してみた(前編) - give IT a try


public static int ToInt(string str)
    return str
        .Select((c, i) => new KeyValuePair<int, int>(i, (int)c - (int)'A' + 1))
        .Aggregate(0, (sum, pair) => sum + pair.Value * (int)Math.Pow(26, pair.Key));
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