贪婪算法实例：换零钱（VB.net代码）

Public Class frmMoney
    Const conMax = 9
    Public intValue(conMax) As Integer

    Private Sub frmMoney_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        lblTell.Text = "贪婪算法追求最快得到结果的算法，它可能不是最优解。" & vbCrLf &
            "例如找零钱的组合可能有很多，贪婪算法从大面值到小面值按每种面值最大可能来考虑。"
        lblMoney.Text = "零钱数额"

    End Sub

    Private Sub btnMoney_Click(sender As Object, e As EventArgs) Handles btnMoney.Click
        intValue = {10000, 5000, 2000, 1000, 500, 200, 100, 50, 20, 10}
        Dim intNum(conMax) As Integer
        If IsNumeric(txtMoney.Text) Then
            Dim intMoney As Integer
            Try
                intMoney = CInt(txtMoney.Text * 100)  '转换成整数，也就是按分来计算，不是按元来计算
                If intMoney > 0 AndAlso intMoney < 10000 Then
                    '找零钱计算
                    exchange(intMoney, intNum)
                    '显示结果
                    '先清除列表原有数据
                    lstMoney.Items.Clear()
                    '列出不同面值的张数
                    For intI As Integer = 0 To conMax
                        lstMoney.Items.Add("面值" & intValue(intI) / 100 & "元 " & intNum(intI) & "张")
                    Next
                Else
                    MsgBox("错误，零钱数额超出合理范围，请重新输入")
                End If
            Catch ex As Exception
                MsgBox("错误，数字超出范围")
            End Try
        Else
            MsgBox("错误，不是数字")
        End If
    End Sub

    Private Sub exchange(ByVal intMoney As Integer, ByRef intNum() As Integer)
        '贪婪算法，从大面值到小面值，每种面值取最大可能
        intValue = {10000, 5000, 2000, 1000, 500, 200, 100, 50, 20, 10}
        Dim intI, intJ As Integer
        '分值四舍五入
        If intMoney Mod 10 >= 5 Then
            intMoney = (intMoney \ 10 + 1) * 10
        Else
            intMoney = (intMoney \ 10) * 10
        End If
        '贪婪算法
        For intI = 0 To conMax
            If intMoney >= intValue(intI) Then
                For intJ = 1 To conMax
                    If intMoney >= intJ * intValue(intI) Then
                        intNum(intI) = intJ
                    Else
                        intMoney = intMoney - （intJ - 1) * intValue(intI)
                        Exit For
                    End If
                Next
            ElseIf intMoney = 0 Then
                Exit For
            End If
        Next
    End Sub

    Private Sub 作品集ToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles 作品集ToolStripMenuItem.Click
        Process.Start("https://pan.baidu.com/s/1jr_3Yt5l1i6jNNbMy4R61A")
        My.Computer.Clipboard.Clear()
        My.Computer.Clipboard.SetText("5ycz")
        MsgBox("提取码5ycz已复制，直接到网页粘贴即可")
    End Sub

    Private Sub 更新下载ToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles 更新下载ToolStripMenuItem.Click
        Process.Start("https://pan.baidu.com/s/18R8VmtMD8y7gE87sBeve9A")
        My.Computer.Clipboard.Clear()
        My.Computer.Clipboard.SetText("ewce")
        MsgBox("提取码ewce已复制，直接到网页粘贴即可")
    End Sub

    Private Sub 代码浏览ToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles 代码浏览ToolStripMenuItem.Click
        Process.Start("https://blog.youkuaiyun.com/kguncn/article/details/109262613")
    End Sub
End Class