题解 | #手机键盘#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        // 按键次数
        int[] keyCount = {1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
        // 字母位置
        int[] keyLocation = {1,1,1,2,2,2,3,3,3,4,4,4,5,5,5,6,6,6,6,7,7,7,8,8,8,8};

        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            String str = in.next();
            int preIndex = 0;
            int total = 0;
            for (int i = 0; i < str.length(); i++) {
                char current = str.charAt(i);// 当前字符
                int currentIndex = 26 - ('z' - current + 1);// 当前字符索引
                if (i!=0) {// 第一次循环跳过前一个字符的运算
                    if(keyLocation[preIndex] == keyLocation[currentIndex]){
                        total += 2;
                    }
                }
                total += keyCount[currentIndex];
                preIndex = currentIndex;
            }
            System.out.println(total);
        }
    }
}