Update solution 0242

README.md

@@ -1660,7 +1660,7 @@
 |1519|Number of Nodes in the Sub-Tree With the Same Label||38.2%|Medium||
 |1520|Maximum Number of Non-Overlapping Substrings||37.0%|Hard||
 |1521|Find a Value of a Mysterious Function Closest to Target||43.8%|Hard||
-|1522|Diameter of N-Ary Tree||70.6%|Medium||
+|1522|Diameter of N-Ary Tree||70.7%|Medium||
 |1523|Count Odd Numbers in an Interval Range||53.9%|Easy||
 |1524|Number of Sub-arrays With Odd Sum||41.5%|Medium||
 |1525|Number of Good Ways to Split a String||69.7%|Medium||
@@ -1900,7 +1900,7 @@
 |1759|Count Number of Homogenous Substrings||44.0%|Medium||
 |1760|Minimum Limit of Balls in a Bag||54.5%|Medium||
 |1761|Minimum Degree of a Connected Trio in a Graph||39.5%|Hard||
-|1762|Buildings With an Ocean View||81.3%|Medium||
+|1762|Buildings With an Ocean View||81.4%|Medium||
 |1763|Longest Nice Substring||61.5%|Easy||
 |1764|Form Array by Concatenating Subarrays of Another Array||53.1%|Medium||
 |1765|Map of Highest Peak||57.6%|Medium||

leetcode/0242.Valid-Anagram/242. Valid Anagram.go

@@ -1,26 +1,5 @@
 package leetcode
 
-// suggestion
-func isAnagram2(s string, t string) bool {
-	hash := map[rune]int{}
-
-	for _, value := range s {
-		hash[value]++
-	}
-
-	for _, value := range t {
-		hash[value]--
-	}
-
-	for _, value := range hash {
-		if value != 0 {
-			return false
-		}
-	}
-
-	return true
-}
-
 // 解法一
 func isAnagram(s string, t string) bool {
 	alphabet := make([]int, 26)
@@ -45,44 +24,17 @@ func isAnagram(s string, t string) bool {
 
 // 解法二
 func isAnagram1(s string, t string) bool {
-	if s == "" && t == "" {
-		return true
+	hash := map[rune]int{}
+	for _, value := range s {
+		hash[value]++
 	}
-	if s == "" || t == "" {
-		return false
+	for _, value := range t {
+		hash[value]--
 	}
-	sBytes := []byte(s)
-	tBytes := []byte(t)
-	if len(sBytes) != len(tBytes) {
-		return false
-	}
-	quickSortByte(sBytes, 0, len(sBytes)-1)
-	quickSortByte(tBytes, 0, len(tBytes)-1)
-
-	for i := 0; i < len(sBytes); i++ {
-		if sBytes[i] != tBytes[i] {
+	for _, value := range hash {
+		if value != 0 {
 			return false
 		}
 	}
 	return true
 }
-func partitionByte(a []byte, lo, hi int) int {
-	pivot := a[hi]
-	i := lo - 1
-	for j := lo; j < hi; j++ {
-		if a[j] > pivot {
-			i++
-			a[j], a[i] = a[i], a[j]
-		}
-	}
-	a[i+1], a[hi] = a[hi], a[i+1]
-	return i + 1
-}
-func quickSortByte(a []byte, lo, hi int) {
-	if lo >= hi {
-		return
-	}
-	p := partitionByte(a, lo, hi)
-	quickSortByte(a, lo, p-1)
-	quickSortByte(a, p+1, hi)
-}

leetcode/1877.Minimize-Maximum-Pair-Sum-in-Array/1877. Minimize Maximum Pair Sum in Array.go

@@ -0,0 +1,19 @@
+package leetcode
+
+import "sort"
+
+func minPairSum(nums []int) int {
+	sort.Ints(nums)
+	n, res := len(nums), 0
+	for i, val := range nums[:n/2] {
+		res = max(res, val+nums[n-1-i])
+	}
+	return res
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}

website/content/ChapterFour/0200~0299/0242.Valid-Anagram.md

@@ -72,47 +72,21 @@ func isAnagram(s string, t string) bool {
 
 // 解法二
 func isAnagram1(s string, t string) bool {
-	if s == "" && t == "" {
-		return true
+	hash := map[rune]int{}
+	for _, value := range s {
+		hash[value]++
 	}
-	if s == "" || t == "" {
-		return false
+	for _, value := range t {
+		hash[value]--
 	}
-	sBytes := []byte(s)
-	tBytes := []byte(t)
-	if len(sBytes) != len(tBytes) {
-		return false
-	}
-	quickSortByte(sBytes, 0, len(sBytes)-1)
-	quickSortByte(tBytes, 0, len(tBytes)-1)
-
-	for i := 0; i < len(sBytes); i++ {
-		if sBytes[i] != tBytes[i] {
+	for _, value := range hash {
+		if value != 0 {
 			return false
 		}
 	}
 	return true
 }
-func partitionByte(a []byte, lo, hi int) int {
-	pivot := a[hi]
-	i := lo - 1
-	for j := lo; j < hi; j++ {
-		if a[j] > pivot {
-			i++
-			a[j], a[i] = a[i], a[j]
-		}
-	}
-	a[i+1], a[hi] = a[hi], a[i+1]
-	return i + 1
-}
-func quickSortByte(a []byte, lo, hi int) {
-	if lo >= hi {
-		return
-	}
-	p := partitionByte(a, lo, hi)
-	quickSortByte(a, lo, p-1)
-	quickSortByte(a, p+1, hi)
-}
+
 
 ```