BrontTrousle - HackerRank world code sprint #6 - study code #2

BrontTrousle_studycode2.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
class Solution {
    static void Main(String[] args) {
        var sb = new StringBuilder();
        int _tc_ = int.Parse(Console.ReadLine());
        while (_tc_-- > 0) {
            var tmp = Console.ReadLine().Split(' ');
            long n = long.Parse(tmp[0]);    // buy these sticks
            long k = long.Parse(tmp[1]);    // they have these boxes
            long b = long.Parse(tmp[2]);    // buy these boxes

            sb.Append(Skeleton(n, k, b)).Append("\n");
        }
        sb.Length--;
        Console.WriteLine(sb.ToString());
    }

    static string Skeleton(long n, long k, long b) {
        List<long> sticks = new List<long>();
        while (b > 0 && k > 0) {
            long r = one23(b - 1);
            var cur = Math.Min(k, n - r);
            sticks.Add(cur);
            k = cur - 1;
            n -= cur;
            b--;
        }
        if (b != 0 || n != 0) return "-1";
        return string.Join(" ", sticks);
    }

    static long one23(long n) { return (n * (n + 1)) / 2; }
}