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?微信公眾號：山青詠芝（shanqingyongzhi）
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?原文地址：?https://www.cnblogs.com/strengthen/p/10562647.html?
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A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com", and at the lowest level, "discuss.leetcode.com". When we visit a domain like "discuss.leetcode.com", we will also visit the parent domains "leetcode.com" and "com" implicitly.

Now, call a "count-paired domain" to be a count (representing the number of visits this domain received), followed by a space, followed by the address. An example of a count-paired domain might be "9001 discuss.leetcode.com".

We are given a list?cpdomains?of count-paired domains. We would like a list of count-paired domains, (in the same format as the input, and in any order), that explicitly counts the number of visits to each subdomain.

Example 1: Input: ["9001 discuss.leetcode.com"] Output: ["9001 discuss.leetcode.com", "9001 leetcode.com", "9001 com"] Explanation: We only have one website domain: "discuss.leetcode.com". As discussed above, the subdomain "leetcode.com" and "com" will also be visited. So they will all be visited 9001 times. Example 2: Input: ["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"] Output: ["901 mail.com","50 yahoo.com","900 google.mail.com","5 wiki.org","5 org","1 intel.mail.com","951 com"] Explanation: We will visit "google.mail.com" 900 times, "yahoo.com" 50 times, "intel.mail.com" once and "wiki.org" 5 times. For the subdomains, we will visit "mail.com" 900 + 1 = 901 times, "com" 900 + 50 + 1 = 951 times, and "org" 5 times.

Notes:

• The length of?cpdomains?will not exceed?100.?
• The length of each domain name will not exceed?100.
• Each address will have either 1 or 2 "." characters.
• The input count?in any count-paired domain will not exceed?10000.
• The answer output can be returned in any order.

---

一個網站域名，如"discuss.leetcode.com"，包含了多個子域名。作為頂級域名，常用的有"com"，下一級則有"leetcode.com"，最低的一級為"discuss.leetcode.com"。當我們訪問域名"discuss.leetcode.com"時，也同時訪問了其父域名"leetcode.com"以及頂級域名?"com"。

給定一個帶訪問次數和域名的組合，要求分別計算每個域名被訪問的次數。其格式為訪問次數+空格+地址，例如："9001 discuss.leetcode.com"。

接下來會給出一組訪問次數和域名組合的列表cpdomains?。要求解析出所有域名的訪問次數，輸出格式和輸入格式相同，不限定先后順序。

示例 1: 輸入: ["9001 discuss.leetcode.com"] 輸出: ["9001 discuss.leetcode.com", "9001 leetcode.com", "9001 com"] 說明: 例子中僅包含一個網站域名："discuss.leetcode.com"。按照前文假設，子域名"leetcode.com"和"com"都會被訪問，所以它們都被訪問了9001次。 示例 2 輸入: ["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"] 輸出: ["901 mail.com","50 yahoo.com","900 google.mail.com","5 wiki.org","5 org","1 intel.mail.com","951 com"] 說明: 按照假設，會訪問"google.mail.com" 900次，"yahoo.com" 50次，"intel.mail.com" 1次，"wiki.org" 5次。 而對于父域名，會訪問"mail.com" 900+1 = 901次，"com" 900 + 50 + 1 = 951次，和 "org" 5 次。

注意事項：

• ?cpdomains?的長度小于?100。
• 每個域名的長度小于100。
• 每個域名地址包含一個或兩個"."符號。
• 輸入中任意一個域名的訪問次數都小于10000。

---

Runtime:?92 ms Memory Usage:?19.8 MB 1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var res:[String] = [String]() 4 var subdomainCnt:[String:Int] = [String:Int]() 5 for cpdomain in cpdomains 6 { 7 var spaceIdx = cpdomain.index(of: " ")! 8 var cnt:Int = Int(String(cpdomain[cpdomain.startIndex..<spaceIdx])) ?? 0 9 var rem:String = String(cpdomain[spaceIdx..<cpdomain.endIndex]) 10 rem.remove(at:rem.startIndex) 11 for i in 0..<rem.count 12 { 13 if rem[i] == "." 14 { 15 subdomainCnt[rem.subString(i + 1),default:0] += cnt 16 } 17 } 18 subdomainCnt[rem,default:0] += cnt 19 } 20 for (key,val) in subdomainCnt 21 { 22 res.append(String(val) + " " + key) 23 } 24 return res 25 } 26 } 27 28 //String擴展 29 extension String { 30 //subscript函數可以檢索數組中的值 31 //直接按照索引方式截取指定索引的字符 32 subscript (_ i: Int) -> Character { 33 //讀取字符 34 get {return self[index(startIndex, offsetBy: i)]} 35 } 36 37 // 截取字符串：從index到結束處 38 // - Parameter index: 開始索引 39 // - Returns: 子字符串 40 func subString(_ index: Int) -> String { 41 let theIndex = self.index(self.endIndex, offsetBy: index - self.count) 42 return String(self[theIndex..<endIndex]) 43 } 44 }

---

92ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var domainDict = Dictionary<String, Int>() 4 var result = [String]() 5 for cpdomain in cpdomains { 6 let domainPair = cpdomain.split(separator: " ") 7 let count = Int(domainPair[0])! 8 var domain = String(domainPair[1]) 9 domainDict[domain] = (domainDict[domain] ?? 0) + count 10 while let index = domain.firstIndex(of: ".") { 11 domain.removeSubrange(domain.startIndex...index) 12 domainDict[domain] = (domainDict[domain] ?? 0) + count 13 } 14 } 15 for (d, c) in domainDict { 16 result.append("\(c) \(d)") 17 } 18 return result 19 } 20 }

---

96ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var result = [String: Int]() 4 cpdomains.forEach { (cpdomain) in 5 let parts = cpdomain.split(separator: " ") 6 let times = Int(parts[0]) ?? 0 7 var domain = String(parts[1]) 8 9 result[domain] = (result[domain] ?? 0) + times 10 11 while let dotIndex = domain.index(of: ".") { 12 domain.removeSubrange(domain.startIndex...dotIndex) 13 result[domain] = (result[domain] ?? 0) + times 14 } 15 } 16 return result.reduce(into: []) { (a, pair) in 17 a.append("\(pair.value) \(pair.key)") 18 } 19 } 20 }

---

98ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var res = [String: Int]() 4 5 for domain in cpdomains { 6 let splits = domain.split(separator: " ").map { String($0) } 7 let count = Int(splits[0])! 8 let domain = splits[1] 9 let frags = domain.split(separator: ".").map { String($0) } 10 var curr = [String]() 11 for i in Array(0..<frags.count).reversed() { 12 curr.append(frags[i]) 13 let subdomain = curr.reversed().joined(separator: ".") 14 res[subdomain] = (res[subdomain] ?? 0) + count 15 } 16 } 17 18 return res.map { "\($0.value) \($0.key)" } 19 } 20 }

---

100ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var ans = [String : Int](); 4 for domain in cpdomains { 5 let t = domain.split(separator: " ") 6 let count = Int(t[0])! 7 let domains = t[1].split(separator: ".") 8 var computedDomain = "" 9 for s in domains.reversed() { 10 if computedDomain == "" { 11 computedDomain = String(s) 12 } else { 13 computedDomain = s + "." + computedDomain 14 } 15 if let c = ans[computedDomain] { 16 ans[computedDomain] = count + c 17 } else { 18 ans[computedDomain] = count 19 } 20 } 21 } 22 23 let result = ans.map { (k, v) in 24 "\(v) \(k)" 25 } 26 return result 27 } 28 }

---

104ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var dict = [String: Int]() 4 for domain in cpdomains { 5 let items = domain.split(separator: " ") 6 let cpdo = items[1].split(separator: ".") 7 var key = "" 8 for i in (0..<cpdo.count).reversed() { 9 if i != cpdo.count - 1 { 10 key = "." + key 11 } 12 key = cpdo[i] + key 13 dict[key] = dict[key] ?? 0 14 dict[key]! += Int(items[0])! 15 } 16 } 17 var result = [String]() 18 for (key, value) in dict { 19 result.append(String(value) + " " + key) 20 } 21 return result 22 } 23 }

---

108ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var dict: [String: Int] = [:] 4 cpdomains.forEach({ countAndDomain in 5 let count = Int(countAndDomain.split(separator: " ")[0]) ?? 0 6 var domain = String(countAndDomain.split(separator: " ")[1]) 7 dict[domain] = (dict[domain] ?? 0) + count 8 while let dotIndex = domain.firstIndex(of: ".") { 9 domain.removeSubrange(domain.startIndex...dotIndex) 10 dict[domain] = (dict[domain] ?? 0) + count 11 } 12 }) 13 return dict.reduce([String](), {a, pair in 14 var a = a 15 a.append("\(pair.value) \(pair.key)") 16 return a 17 }) 18 } 19 }

---

116ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var result:[String: Int] = [String: Int]() 4 for domain in cpdomains { 5 let split = domain.split(separator: " ") 6 if let countString = split.first, let count = Int(countString), let domains = split.last { 7 let domainComponents = Array(domains.split(separator: ".").reversed()) 8 for idx in 0..<domainComponents.count { 9 let curr = Array(domainComponents[0...idx].reversed()) 10 let currDomain = String(curr.joined(separator: ".")).lowercased() 11 result[currDomain] = (result[currDomain] ?? 0) + count 12 } 13 } 14 } 15 16 var answer: [String] = [String]() 17 for (key, val) in result { 18 answer.append("\(val) \(key)") 19 } 20 return answer 21 } 22 }

---

144ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var results: [String:Int] = [:] 4 cpdomains.forEach { domain in 5 let splited = domain.components(separatedBy: " ") 6 if splited.count > 1 { 7 let counter = splited[0] 8 let splitedDomain = splited[1] 9 10 let dots = splitedDomain.components(separatedBy: ".") 11 for i in 0..<(dots.count) { 12 var d = dots[i] 13 for j in (i+1)..<dots.count { 14 d += "." + dots[j] 15 } 16 results[d] = (Int(counter) ?? 0) + (results[d] ?? 0) 17 } 18 } 19 } 20 return results.map { String($0.1) + " " + $0.0 } 21 } 22 }

---

156ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var dict = [String: Int]() 4 for e in cpdomains { 5 let c = e.components(separatedBy: " ") 6 let count = Int(c[0])! 7 let domain = c[1] 8 let subdomains = domain.components(separatedBy: ".") 9 for i in subdomains.indices { 10 let sub = subdomains[i...].joined(separator: ".") 11 dict[sub, default: 0] += count 12 } 13 } 14 return dict.map { "\($0.value) \($0.key)"} 15 } 16 }

---

172ms

1 class Solution { 2 func subdomainVisits(_ cpdomains: [String]) -> [String] { 3 var res = [String]() 4 var dict = [String: Int]() 5 for cpdomain in cpdomains { 6 let visit = retrieveCount(cpdomain) 7 let count = Int(visit) ?? 0 8 let domain = retrieveDomain(cpdomain) 9 var subdomains = domain.components(separatedBy: ".") 10 while (subdomains.count > 0) { 11 let str = subdomains.joined(separator: ".") 12 if var visited = dict[str] { 13 visited += count 14 dict.updateValue(visited, forKey: str) 15 } else { 16 dict.updateValue(count, forKey: str) 17 } 18 subdomains.removeFirst() 19 } 20 } 21 22 for subdomain in dict.keys { 23 let visits = dict[subdomain] ?? 0 24 let cpdomain = String(visits) + " " + subdomain 25 res.append(cpdomain) 26 } 27 return res 28 } 29 30 func retrieveDomain(_ cpdomain: String) -> String { 31 let parts = cpdomain.components(separatedBy: " ") 32 return parts.last ?? "" 33 } 34 35 func retrieveCount(_ cpdomain: String) -> String { 36 let parts = cpdomain.components(separatedBy: " ") 37 return parts.first ?? "" 38 } 39 }

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轉載于:https://www.cnblogs.com/strengthen/p/10562647.html

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