enhance code quality (#44)

Author: zsdostar

Codes/zsdostar/2_add-two-numbers/solve.go

@@ -2,6 +2,7 @@ package main
 
 import "fmt"
 
+// ListNode definition for singly-linked list.
 type ListNode struct {
 	Val  int
 	Next *ListNode

Codes/zsdostar/4_median-of-two-sorted-arrays/solve.go

@@ -33,15 +33,17 @@ func mergeTwoSortedArray(nums1, nums2 *[]int) []int {
 	return nums
 }
 func findMedianSortedArrays(nums1 []int, nums2 []int) float64 {
+	var midRes float64
 	totalLen := len(nums1) + len(nums2)
 	nums := mergeTwoSortedArray(&nums1, &nums2)
 	mid := totalLen / 2
 
 	if totalLen%2 == 1 {
-		return float64(nums[mid])
+		midRes = float64(nums[mid])
 	} else {
-		return (float64(nums[mid-1]) + float64(nums[mid])) / 2
+		midRes = (float64(nums[mid-1]) + float64(nums[mid])) / 2
 	}
+	return midRes
 }
 func main() {
 	fmt.Println(findMedianSortedArrays([]int{1}, []int{}))

Codes/zsdostar/6_zigzag-conversion/solve.go

@@ -3,6 +3,8 @@ package main
 import "fmt"
 
 // 题解: https://leetcode-cn.com/problems/zigzag-conversion/solution/bu-kuai-dan-te-wu-nao-de-yi-ge-jie-fa-_z_-by-zsdos/
+
+// Min return the min value of two int.
 func Min(x, y int) int {
 	if x < y {
 		return x

Codes/zsdostar/8_string-to-integer-atoi/solve.go

@@ -18,13 +18,12 @@ var ascii = map[int32]int{
 	'9': 9,
 }
 
-func myAtoi(str string) int {
-	// 4 ms, 2.3 MB
-	signed := ""
-	temp, res := "", 0
+func cleanStr(str string) (string, string) {
+	// 转化成为干净的数字字符串
+	res, signed := "", ""
 	// 死抠细节, 变态的数据。。
 	for _, v := range str {
-		if (v == ' ' || v == '-' || v == '+') && (len(temp) > 0 || signed != "") {
+		if (v == ' ' || v == '-' || v == '+') && (len(res) > 0 || signed != "") {
 			break
 		}
 		switch v {
@@ -40,15 +39,11 @@ func myAtoi(str string) int {
 		if _, ok := ascii[v]; !ok {
 			break
 		}
-		temp += string(v)
-	}
-	// temp已经成为干净的数字字符串，只需按位转为int即可
-	for k, v := range temp {
-		res += int(float64(ascii[v]) * math.Pow(10.0, float64(len(temp)-k-1)))
-	}
-	if signed == "-" {
-		res = -res
+		res += string(v)
 	}
+	return res, signed
+}
+func checkOverflow(res int, signed string) int {
 	// 注意太大值溢出变为负数的问题
 	max, min := math.MaxInt32, -(math.MaxInt32 + 1)
 	if res > max {
@@ -64,9 +59,23 @@ func myAtoi(str string) int {
 			}
 		}
 	}
-
 	return res
 }
+func myAtoi(str string) int {
+	// 4 ms, 2.3 MB
+	temp, signed := cleanStr(str)
+	res := 0
+	// 对于clean后的字符串, 只需按位转为int即可
+	for k, v := range temp {
+		res += int(float64(ascii[v]) * math.Pow(10.0, float64(len(temp)-k-1)))
+	}
+
+	if signed == "-" {
+		res = -res
+	}
+
+	return checkOverflow(res, signed)
+}
 
 func main() {
 	fmt.Println(myAtoi("2147483648"))