Modify solution 0164

leetcode/0164.Maximum-Gap/164. Maximum Gap.go

@@ -1,12 +1,11 @@
 package leetcode
 
-// 解法一
+// 解法一 快排
 func maximumGap(nums []int) int {
 	if len(nums) < 2 {
 		return 0
 	}
 	quickSort164(nums, 0, len(nums)-1)
-
 	res := 0
 	for i := 0; i < len(nums)-1; i++ {
 		if (nums[i+1] - nums[i]) > res {
@@ -37,52 +36,42 @@ func quickSort164(a []int, lo, hi int) {
 	quickSort164(a, p+1, hi)
 }
 
-// 解法二
+// 解法二 基数排序
 func maximumGap1(nums []int) int {
-
 	if nums == nil || len(nums) < 2 {
 		return 0
 	}
-
 	// m is the maximal number in nums
 	m := nums[0]
 	for i := 1; i < len(nums); i++ {
 		m = max(m, nums[i])
 	}
-
 	exp := 1 // 1, 10, 100, 1000 ...
 	R := 10  // 10 digits
-
 	aux := make([]int, len(nums))
-
 	for (m / exp) > 0 { // Go through all digits from LSB to MSB
 		count := make([]int, R)
-
 		for i := 0; i < len(nums); i++ {
 			count[(nums[i]/exp)%10]++
 		}
-
 		for i := 1; i < len(count); i++ {
 			count[i] += count[i-1]
 		}
-
 		for i := len(nums) - 1; i >= 0; i-- {
 			tmp := count[(nums[i]/exp)%10]
 			tmp--
 			aux[tmp] = nums[i]
+			count[(nums[i]/exp)%10] = tmp
 		}
-
 		for i := 0; i < len(nums); i++ {
 			nums[i] = aux[i]
 		}
 		exp *= 10
 	}
-
 	maxValue := 0
 	for i := 1; i < len(aux); i++ {
 		maxValue = max(maxValue, aux[i]-aux[i-1])
 	}
-
 	return maxValue
 }
 

leetcode/0164.Maximum-Gap/164. Maximum Gap_test.go

@@ -49,6 +49,11 @@ func Test_Problem164(t *testing.T) {
 			para164{[]int{2, 435, 214, 64321, 643, 7234, 7, 436523, 7856, 8}},
 			ans164{372202},
 		},
+
+		{
+			para164{[]int{1, 10000000}},
+			ans164{9999999},
+		},
 	}
 
 	fmt.Printf("------------------------Leetcode Problem 164------------------------\n")

website/content/ChapterFour/0164.Maximum-Gap.md

@@ -51,13 +51,12 @@ Explanation: The array contains less than 2 elements, therefore return 0.
 
 package leetcode
 
-// 解法一
+// 解法一 快排
 func maximumGap(nums []int) int {
 	if len(nums) < 2 {
 		return 0
 	}
 	quickSort164(nums, 0, len(nums)-1)
-
 	res := 0
 	for i := 0; i < len(nums)-1; i++ {
 		if (nums[i+1] - nums[i]) > res {
@@ -88,53 +87,51 @@ func quickSort164(a []int, lo, hi int) {
 	quickSort164(a, p+1, hi)
 }
 
-// 解法二
+// 解法二 基数排序
 func maximumGap1(nums []int) int {
-
 	if nums == nil || len(nums) < 2 {
 		return 0
 	}
-
 	// m is the maximal number in nums
 	m := nums[0]
 	for i := 1; i < len(nums); i++ {
 		m = max(m, nums[i])
 	}
-
 	exp := 1 // 1, 10, 100, 1000 ...
 	R := 10  // 10 digits
-
 	aux := make([]int, len(nums))
-
 	for (m / exp) > 0 { // Go through all digits from LSB to MSB
 		count := make([]int, R)
-
 		for i := 0; i < len(nums); i++ {
 			count[(nums[i]/exp)%10]++
 		}
-
 		for i := 1; i < len(count); i++ {
 			count[i] += count[i-1]
 		}
-
 		for i := len(nums) - 1; i >= 0; i-- {
 			tmp := count[(nums[i]/exp)%10]
 			tmp--
 			aux[tmp] = nums[i]
+			count[(nums[i]/exp)%10] = tmp
 		}
-
 		for i := 0; i < len(nums); i++ {
 			nums[i] = aux[i]
 		}
 		exp *= 10
 	}
-
 	maxValue := 0
 	for i := 1; i < len(aux); i++ {
 		maxValue = max(maxValue, aux[i]-aux[i-1])
 	}
-
 	return maxValue
 }
 
+func max(a int, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+
 ```