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?微信公眾號(hào)：山青詠芝（shanqingyongzhi）
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?GitHub地址：https://github.com/strengthen/LeetCode
?原文地址：?https://www.cnblogs.com/strengthen/p/10499508.html?
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You're now a baseball game point recorder.

Given a list of strings, each string can be one of the 4 following types:

Integer?(one round's score): Directly represents the number of points you get in this round.

"+"?(one round's score): Represents that the points you get in this round are the sum of the last two?validround's points.

"D"?(one round's score): Represents that the points you get in this round are the doubled data of the last?valid?round's points.

"C"?(an operation, which isn't a round's score): Represents the last?valid?round's points you get were invalid and should be removed.?

Each round's operation is permanent and could have an impact on the round before and the round after.

You need to return the sum of the points you could get in all the rounds.

Example 1:

Input: ["5","2","C","D","+"] Output: 30 Explanation: Round 1: You could get 5 points. The sum is: 5. Round 2: You could get 2 points. The sum is: 7. Operation 1: The round 2's data was invalid. The sum is: 5. Round 3: You could get 10 points (the round 2's data has been removed). The sum is: 15. Round 4: You could get 5 + 10 = 15 points. The sum is: 30.?

Example 2:

Input: ["5","-2","4","C","D","9","+","+"] Output: 27 Explanation: Round 1: You could get 5 points. The sum is: 5. Round 2: You could get -2 points. The sum is: 3. Round 3: You could get 4 points. The sum is: 7. Operation 1: The round 3's data is invalid. The sum is: 3. Round 4: You could get -4 points (the round 3's data has been removed). The sum is: -1. Round 5: You could get 9 points. The sum is: 8. Round 6: You could get -4 + 9 = 5 points. The sum is 13. Round 7: You could get 9 + 5 = 14 points. The sum is 27.?

Note:

• The size of the input list will be between 1 and 1000.
• Every integer represented in the list will be between -30000 and 30000.

---

你現(xiàn)在是棒球比賽記錄員。
給定一個(gè)字符串列表，每個(gè)字符串可以是以下四種類型之一：
1.整數(shù)（一輪的得分）：直接表示您在本輪中獲得的積分?jǐn)?shù)。
2.?"+"（一輪的得分）：表示本輪獲得的得分是前兩輪有效?回合得分的總和。
3.?"D"（一輪的得分）：表示本輪獲得的得分是前一輪有效?回合得分的兩倍。
4.?"C"（一個(gè)操作，這不是一個(gè)回合的分?jǐn)?shù)）：表示您獲得的最后一個(gè)有效?回合的分?jǐn)?shù)是無效的，應(yīng)該被移除。

每一輪的操作都是永久性的，可能會(huì)對(duì)前一輪和后一輪產(chǎn)生影響。
你需要返回你在所有回合中得分的總和。

示例 1:

輸入: ["5","2","C","D","+"] 輸出: 30 解釋: 第1輪：你可以得到5分。總和是：5。 第2輪：你可以得到2分。總和是：7。 操作1：第2輪的數(shù)據(jù)無效。總和是：5。 第3輪：你可以得到10分（第2輪的數(shù)據(jù)已被刪除）。總數(shù)是：15。 第4輪：你可以得到5 + 10 = 15分。總數(shù)是：30。

示例 2:

輸入: ["5","-2","4","C","D","9","+","+"] 輸出: 27 解釋: 第1輪：你可以得到5分。總和是：5。 第2輪：你可以得到-2分。總數(shù)是：3。 第3輪：你可以得到4分。總和是：7。 操作1：第3輪的數(shù)據(jù)無效。總數(shù)是：3。 第4輪：你可以得到-4分（第三輪的數(shù)據(jù)已被刪除）。總和是：-1。 第5輪：你可以得到9分。總數(shù)是：8。 第6輪：你可以得到-4 + 9 = 5分。總數(shù)是13。 第7輪：你可以得到9 + 5 = 14分。總數(shù)是27。

注意：

• 輸入列表的大小將介于1和1000之間。
• 列表中的每個(gè)整數(shù)都將介于-30000和30000之間。

---

Runtime:?28 ms Memory Usage:?20.1 MB 1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 var v:[Int] = [Int]() 4 for op in ops 5 { 6 if op == "+" 7 { 8 v.append(v.last! + v[v.count - 2]) 9 } 10 else if op == "D" 11 { 12 v.append(2 * v.last!) 13 } 14 else if op == "C" 15 { 16 v.popLast() 17 } 18 else 19 { 20 v.append(Int(op)!) 21 } 22 } 23 return v.reduce(0,+) 24 } 25 }

---

28ms

1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 var points:Int = 0 4 var poStack:[Int] = [] 5 6 for i in 0..<ops.count { 7 if ops[i] == "+" { 8 let n:Int = poStack.count - 2 9 points = points + poStack[n] + poStack.last! 10 poStack.append(poStack[n] + poStack.last!) 11 12 }else if ops[i] == "C"{ 13 let temp:Int = poStack.last! 14 poStack.removeLast() 15 points = points - temp 16 17 }else if ops[i] == "D" { 18 points = points + poStack.last! * 2 19 let po = poStack.last! * 2 20 poStack.append(po) 21 22 }else{ 23 points = points + Int(ops[i])! 24 poStack.append(Int(ops[i])!) 25 } 26 } 27 28 return points 29 } 30 }

---

32ms

1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 var stack = [Int]() 4 var sum = 0 5 for ch in ops { 6 switch ch { 7 case "C": 8 let x = stack.removeLast() 9 sum -= x 10 case "D": 11 if let x = stack.last { 12 stack.append(x * 2) 13 sum += x * 2 14 } 15 case "+": 16 if stack.count >= 2 { 17 let x = stack[stack.count - 1] 18 let y = stack[stack.count - 2] 19 stack.append(x + y) 20 sum += (x + y) 21 } 22 default: 23 if let x = Int(ch) { 24 stack.append(x) 25 sum += x 26 } 27 } 28 } 29 return sum 30 } 31 }

---

36ms

1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 var stack = [String]() 4 for op in ops { 5 if Int(op) != nil { 6 stack.append(op) 7 } else if op == "C" && stack.count > 0 { 8 stack.removeLast() 9 } else if op == "D" && stack.count > 0 { 10 stack.append(String(Int(stack.last!)! * 2)) 11 } else if stack.count >= 2 { 12 let sum = String(Int(stack.last!)! + Int(stack[stack.count - 2])!) 13 stack.append(sum) 14 } 15 } 16 17 var ans = 0 18 for item in stack { 19 ans += Int(item)! 20 } 21 return ans 22 } 23 }

---

40ms

1 struct Stack<T: Equatable> { 2 private var list: [T] 3 init() { 4 list = [T]() 5 } 6 var isEmpty:Bool { 7 return list.count == 0 8 } 9 var count: Int { 10 return list.count 11 } 12 mutating func push(_ value: T) { 13 list.append(value) 14 } 15 16 mutating func pop() -> T? { 17 guard !isEmpty else { return nil } 18 return list.removeLast() 19 } 20 21 func peek() -> T? { 22 return list.last 23 } 24 func peekLastButOne() -> T? { 25 guard !isEmpty else { return nil } 26 guard count > 1 else { return nil } 27 return list[count-2] 28 } 29 } 30 31 class Solution { 32 func calPoints(_ ops: [String]) -> Int { 33 var dataStack = Stack<Int>() 34 var totalSum = 0 35 for element in ops { 36 if let number = Int(element) { 37 // handle integers 38 dataStack.push(number) 39 totalSum += number 40 } 41 else { 42 if element == "C" { 43 // cancel case operation 44 let val = dataStack.pop() ?? 0 45 totalSum -= val 46 } else if element == "D" { 47 // double round 48 var val = dataStack.peek() ?? 0 49 val *= 2 50 dataStack.push(val) 51 totalSum += val 52 } else { 53 var val1 = dataStack.peek() ?? 0 54 let val2 = dataStack.peekLastButOne() ?? 0 55 val1 += val2 56 dataStack.push(val1) 57 totalSum += val1 58 // sum of last 2 rounds results 59 } 60 } 61 } 62 return totalSum 63 } 64 }

---

60ms

1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 var history = [Int]() 4 for op in ops { 5 if op == "+" { 6 history.append(history[history.count-1] + history[history.count-2]) 7 } else if op == "D" { 8 history.append(history[history.count-1] * 2) 9 } else if op == "C" { 10 history.removeLast() 11 } else { 12 history.append(Int(op)!) 13 } 14 } 15 16 return history.reduce(0) { $0 + $1 } 17 } 18 }

---

76ms

1 class Solution { 2 func calPoints(_ ops: [String]) -> Int { 3 if ops.count < 1 { 4 return 0 5 } 6 var result = 0 7 var statckArray : [Int] = [] 8 var temp = 0 9 for score in ops { 10 if score == "C" && statckArray.count > 0{ 11 statckArray.removeLast() 12 }else if score == "D" && statckArray.count > 0 { 13 temp = statckArray.last! 14 statckArray.append(temp*2) 15 }else if score == "+" && statckArray.count > 1 { 16 temp = statckArray.last! + statckArray[statckArray.count-2] 17 statckArray.append(temp) 18 }else if score == "+" && statckArray.count == 1 { 19 temp = statckArray.last! 20 statckArray.append(temp) 21 }else if isPurnInt(string: score) { 22 statckArray.append(Int(score)!) 23 } 24 } 25 while statckArray.count > 0 { 26 result = result + statckArray.last! 27 statckArray.removeLast() 28 } 29 return result 30 } 31 func isPurnInt(string: String) -> Bool { 32 let scan: Scanner = Scanner(string: string) 33 var val:Int = 0 34 return scan.scanInt(&val) && scan.isAtEnd 35 36 } 37 }

?

轉(zhuǎn)載于:https://www.cnblogs.com/strengthen/p/10499508.html

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