Add solution 0609、0692、0890、1048、1442、1738

leetcode/0609.Find-Duplicate-File-in-System/609. Find Duplicate File in System.go

@@ -0,0 +1,23 @@
+package leetcode
+
+import "strings"
+
+func findDuplicate(paths []string) [][]string {
+	cache := make(map[string][]string)
+	for _, path := range paths {
+		parts := strings.Split(path, " ")
+		dir := parts[0]
+		for i := 1; i < len(parts); i++ {
+			bracketPosition := strings.IndexByte(parts[i], '(')
+			content := parts[i][bracketPosition+1 : len(parts[i])-1]
+			cache[content] = append(cache[content], dir+"/"+parts[i][:bracketPosition])
+		}
+	}
+	res := make([][]string, 0, len(cache))
+	for _, group := range cache {
+		if len(group) >= 2 {
+			res = append(res, group)
+		}
+	}
+	return res
+}