[Level1] 크레인 인형뽑기 게임 (C++)

#include <string>
#include <vector>
#include <stack>

using namespace std;

int GetADoll(vector<vector<int>>& board, int number) {
    int boardSize = board.size();
    int returnValue = 0;

    for(int height = 0; height < boardSize; height++) {
        if(board.at(height).at(number-1) > 0) {
            returnValue = board.at(height).at(number-1);
            board.at(height).at(number-1) = 0;
            break;
        }
    }
    
    return returnValue; 
}

int solution(vector<vector<int>> board, vector<int> moves) {
    int answer = 0;
    stack<int> s;
    
    for(auto move : moves) {
        int doll = GetADoll(board, move);
       
       // 뽑을 인형이 있으면
        if(doll) {
            if(s.empty() || s.top() != doll) {
                s.push(doll);
            }
            
            else if (s.top() == doll) {
                s.pop();
                answer+=2;
            }
        }
    }
    
    return answer;
}