201803-1 跳一跳

除了記分需要一個變量外，還需一個變量記錄上次得分。如果當前跳到了中心點，那麼需要知道上次得分來計算當前的分。即如果上次得分<2，那麼當前的分爲2，否則當前的分爲上次得分+2

奉上java滿分代碼

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        scanner.close();

        int sum = 0;
        int lastScore = 0, score;
        for(int i = 0; i < line.length(); i++){
            char ch = line.charAt(i);
            if(ch == ' ')
                continue;
            if(ch == '0')
                break;
            score = 1;
            if(ch == '2'){
                score = lastScore < 2 ? 2 : lastScore + 2;
            }
            sum += score;
            lastScore = score;
        }

        System.out.println(sum);
    }
}