更新some_divide

Author: fishedee

go/some_divide/.gitignore

@@ -0,0 +1 @@
+*.exe

go/some_divide/Makefile

@@ -0,0 +1,3 @@
+run:
+	go build .
+	./some_divide

go/some_divide/main.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"fmt"
+	"github.com/shopspring/decimal"
+)
+
+type Problem struct {
+	Price decimal.Decimal
+	Count decimal.Decimal
+	MultiCount []decimal.Decimal
+}
+
+func (problem *Problem) Solve2() []decimal.Decimal{
+	result := []decimal.Decimal{}
+
+	for _,singleCount := range problem.MultiCount{
+		singleResult := singleCount.Mul(problem.Price).Round(2)
+		result = append(result,singleResult)
+	}
+	return result
+}
+
+func (problem *Problem) CheckSolve(result []decimal.Decimal){
+	sum,_ := decimal.NewFromString("0")
+	for _,singleResult := range result{
+		sum = sum.Add(singleResult)
+	}
+	total := problem.Price.Mul(problem.Count).Round(2)
+	fmt.Printf("\nsolution: %v\n",result)
+	if total.Cmp(sum) != 0 {
+		fmt.Printf("solve fail: total %v != sum %v\n",total,sum)
+	}else{
+		fmt.Printf("solve success: total = %v\n",total)
+	}
+}
+
+func (problem *Problem)Solve() []decimal.Decimal {
+	result := []decimal.Decimal{}
+	
+	total := problem.Price.Mul(problem.Count).Round(2)
+	count := problem.Count
+
+	for _,singleCount := range problem.MultiCount{
+
+		//计算当前的值
+		precent := singleCount.Div(count)
+		singleResult := precent.Mul(total).Round(2)
+		result = append(result,singleResult)
+
+		//取余额
+		count = count.Sub(singleCount)
+		total = total.Sub(singleResult)
+	}
+
+	return result;
+}
+
+func NewProblem(price decimal.Decimal,count decimal.Decimal, multiCount []decimal.Decimal) *Problem{
+	if price.Sign() < 0 {
+		panic("price can not be negative")
+	}
+
+	if count.Sign() < 0 {
+		panic("count can not be negative")
+	}
+
+	allCount,_ :=  decimal.NewFromString("0")
+	for _,it := range multiCount{
+		if it.Sign() < 0{
+			panic("multiCount can not be negative")
+		}
+		allCount = allCount.Add(it)
+	}
+	if allCount.Cmp( count) != 0 {
+		panic("multi count sum != count")
+	}
+	problem := &Problem{}
+	problem.Price = price
+	problem.Count = count
+	problem.MultiCount = multiCount
+	return problem
+}
+
+func newDecimal(a string) decimal.Decimal{
+	re,err := decimal.NewFromString(a)
+	if err != nil{
+		panic(err)
+	}
+	return re
+}
+
+func main(){
+	problem := NewProblem(
+		newDecimal("32.23"),
+		newDecimal("10.12"),
+		[]decimal.Decimal{newDecimal("0.01"),newDecimal("0.01"),newDecimal("10.1")},
+	)
+
+	//分摊法
+	result1 := problem.Solve()
+	problem.CheckSolve(result1)
+
+	//原始法
+	result2 := problem.Solve2()
+	problem.CheckSolve(result2)
+}