feat: update go solution to lc problem: No.0012

No.0012.Integer to Roman

Author: ifmagic

solution/0000-0099/0012.Integer to Roman/README.md

@@ -77,8 +77,12 @@ M             1000</pre>
 
 <!-- 这里可写通用的实现逻辑 -->
 
+**方法一：模拟**
+
 贪心算法实现。
 
+时间复杂度为 $O(1)$，空间复杂度为 $O(1)$。
+
 <!-- tabs:start -->
 
 ### **Python3**
@@ -153,6 +157,22 @@ public:
 };
 ```
 
+### **Go**
+
+```go
+func intToRoman(num int) string {
+	ans := ""
+	values := []int{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1}
+	romans := []string{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"}
+	for i, value := range values {
+		for value <= num {
+			ans, num = ans+romans[i], num-value
+		}
+	}
+	return ans
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0012.Integer to Roman/README_EN.md

@@ -62,6 +62,10 @@ M             1000</pre>
 
 ## Solutions
 
+**Approach 1: Simulation**
+
+Time complexity $O(1)$, Space complexity $O(1)$.
+
 <!-- tabs:start -->
 
 ### **Python3**
@@ -132,6 +136,22 @@ public:
 };
 ```
 
+### **Go**
+
+```go
+func intToRoman(num int) string {
+	ans := ""
+	values := []int{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1}
+	romans := []string{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"}
+	for i, value := range values {
+		for value <= num {
+			ans, num = ans+romans[i], num-value
+		}
+	}
+	return ans
+}
+```
+
 ### **...**
 
 ```

solution/0000-0099/0012.Integer to Roman/Solution.go

@@ -1,49 +1,11 @@
-// 字符          数值
-// I             1
-// V             5
-// X             10
-// L             50
-// C             100
-// D             500
-// M             1000
-var table = make(map[int]string)
-var keys = []int{1,4,5,9,10,40,50,90,100,400,500,900,1000}
-
-func init() {
-	table[1] = "I"
-	table[4] = "IV"
-	table[5] = "V"
-	table[9] = "IX"
-	table[10] = "X"
-	table[40] = "XL"
-	table[50] = "L"
-	table[90] = "XC"
-	table[100] = "C"
-	table[400] = "CD"
-	table[500] = "D"
-	table[900] = "CM"
-	table[1000] = "M"
-}
-
 func intToRoman(num int) string {
-	if n, exist := table[num]; exist {
-		return n
+	ans := ""
+	values := []int{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1}
+	romans := []string{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"}
+	for i, value := range values {
+		for value <= num {
+			ans, num = ans+romans[i], num-value
+		}
 	}
-	var result string
-	lenKeys := len(keys)
-	for i:=lenKeys-1; i>=0; i-- {
-		d := keys[i]
-		count := num/d
-		result += genreateRoman(d, count)
-		num = num - d * count
-	}
-	return result
-}
-
-func genreateRoman(n, count int) string {
-	var r string
-	for i:=0; i<count; i++ {
-		r += table[n]
-	}
-	return r
-}
+	return ans
+}