C#根据总价、购买总件数以及单价获取购买商品的方案

/// <summary>
/// 获取方案
/// </summary>
/// <param name="nTotalFund">总资金</param>
/// <param name="nNum">购买商品的总数</param>
/// <param name="nUnitPrice">各类商品单价（预设为三种商品）</param>
public void GetSolution(int nTotalFund, int nNum, List<int> nUnitPrice)
{var soluLists = new List<int[]>();for (var i = 0; i < nNum; i++){for (var j = 0; j < nNum; j++){for (var k = 0; k < nNum; k++){var nTotalValue = nUnitPrice[0] * i + nUnitPrice[1] * j + nUnitPrice[2] * k;if (nTotalValue == nTotalFund && i + j + k == nNum)soluLists.Add(new[] { i, j, k });}}}var mInfo = new StringBuilder();mInfo.AppendLine("购买方案：");foreach (var t in soluLists){mInfo.AppendLine(nUnitPrice[0] + "元商品购买总数:" + t[0].ToString("D2"));mInfo.AppendLine(nUnitPrice[1] + "元商品购买总数:" + t[1].ToString("D2"));mInfo.AppendLine(nUnitPrice[2] + "元商品购买总数:" + t[2].ToString("D2"));var value = nUnitPrice[0] * t[0];value += nUnitPrice[1] * t[1];value += nUnitPrice[2] * t[2];mInfo.AppendLine("合计" + value.ToString("N") + "元整\n");}Debug.WriteLine(mInfo.ToString());
}

输出结果：