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//! Baseball Game [leetcode: baseball_game](https://leetcode.com/problems/baseball-game/) //! //! You're now a baseball game point recorder. //! //! Given a list of strings, each string can be one of the 4 following types: //! //! 1. `Integer` (one round's score): Directly represents the number of points you get in this round. //! 2. `"+"` (one round's score): Represents that the points you get in this round are the sum of the last two `valid` round's points. //! 3. `"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. //! 4. `"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. //! //! **Example1:** //! //! ``` //! 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. //! ``` //! //! **Example2:** //! //! ``` //! 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. //! /// # Solutions /// /// # Approach 1: Stack /// /// * Time complexity: O(n) /// /// * Space complexity: O(n) /// /// * Runtime: 0ms /// /// Memory: 2.6MB /// /// ```rust /// impl Solution { /// pub fn cal_points(ops: Vec<String>) -> i32 { /// let mut stack: Vec<i32> = vec![]; /// let mut sum = 0; /// /// for p in ops.into_iter() { /// match p.as_ref() { /// "+" => { /// let top = stack.pop().unwrap(); /// let new_top = top + stack.last().unwrap(); /// stack.push(top); /// stack.push(new_top); /// }, /// "C" => { stack.pop(); }, /// "D" => { stack.push(2 * stack.last().unwrap()); }, /// _ => { stack.push(p.parse::<i32>().unwrap()); }, /// } /// } /// /// for score in stack { sum += score; } /// /// sum /// } /// } /// ``` /// /// /// # Approach 2: Stack /// /// * Time complexity: O(n) /// /// * Space complexity: O(1) /// /// * Runtime: 0ms /// /// Memory: 2.3MB /// /// ```rust /// impl Solution { /// pub fn cal_points(ops: Vec<String>) -> i32 { /// let mut stack: Vec<i32> = vec![]; /// let mut sum = 0; /// /// for p in ops.into_iter() { /// let mut score = 0; /// match p.as_ref() { /// "+" => { score = stack[stack.len()-1] + stack[stack.len()-2]; }, /// "C" => { /// sum -= stack.pop().unwrap(); /// continue; /// }, /// "D" => { score = 2 * stack.last().unwrap(); }, /// _ => { score = p.parse::<i32>().unwrap(); }, /// } /// sum += score; /// stack.push(score); /// } /// sum /// } /// } /// ``` /// pub fn cal_points(ops: Vec<String>) -> i32 { let mut stack: Vec<i32> = vec![]; let mut sum = 0; for p in ops.into_iter() { match p.as_ref() { "+" => { let top = stack.pop().unwrap(); let new_top = top + stack.last().unwrap(); stack.push(top); stack.push(new_top); }, "C" => { stack.pop(); }, "D" => { stack.push(2 * stack.last().unwrap()); }, _ => { stack.push(p.parse::<i32>().unwrap()); }, } } for score in stack { sum += score; } sum }