48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
#include <vector>
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#include <string>
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#include <numeric>
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#include <stdexcept>
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#include <algorithm>
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/**
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* 682. Baseball Game
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* You are keeping score for a baseball game with strange rules. The game consists of several rounds, where the scores of past rounds may affect future rounds' scores.
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* At the beginning of the game, you start with an empty record. You are given a list of strings ops, where ops[i] is the ith operation you must apply to the record and is one of the following:
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* - An integer x - Record a new score of x.
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* - "+" - Record a new score that is the sum of the previous two scores. It is guaranteed there will always be two previous scores.
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* - "D" - Record a new score that is double the previous score. It is guaranteed there will always be a previous score.
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* - "C" - Invalidate the previous score, removing it from the record. It is guaranteed there will always be a previous score.
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* Return the sum of all the scores on the record.
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*
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* 100% STL implementation!
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*/
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class Solution {
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public:
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static int calPoints(std::vector<std::string>& ops) {
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std::vector<int> scores;
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std::for_each(ops.begin(), ops.end(), [&](const std::string& str) {
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int x;
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try {
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x = std::stoi(str);
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} catch (const std::invalid_argument& ignored) {
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switch (str[0]) {
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case '+':
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scores.push_back(*std::prev(scores.end(), 2) + scores.back());
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break;
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case 'C':
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scores.pop_back();
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break;
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case 'D':
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scores.push_back(2 * scores.back());
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break;
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default:;
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}
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return;
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}
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scores.push_back(x);
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});
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return std::accumulate(scores.begin(), scores.end(), 0);
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}
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};
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