题解 | 多组_一维数组_T组形式

using System;
using System.Text;
public class Program {
    public static void Main() {
        int totalgroup = int.Parse(Console.ReadLine());
            StringBuilder strb = new StringBuilder("");
            for (int g = 0; g < totalgroup; g++)
            {
                int n = int.Parse(Console.ReadLine());
                string[] nums = Console.ReadLine().Split(' ');

                long sum = 0;
                foreach (string s in nums)
                {
                    sum += long.Parse(s);
                }
                strb.Append($"{sum}\n");
            }

            Console.WriteLine(strb.ToString());
            Console.ReadLine();
    }
}