题解 | #压缩牛群编号#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param chars char字符型一维数组 
     * @return char字符型一维数组
     */
    public char[] compress (char[] chars) {
        // write code here
        char cur = chars[0];
        int times = 1, index = 1;
        for (int i = 1; i < chars.length; i++) {
            if (chars[i] == cur) {
                times++;
            } else {
                if (times > 1) {
                    char[] arr = String.valueOf(times).toCharArray();
                    for (char c : arr) {
                        chars[index++] = c;
                    }
                }
                times = 1;
                cur = chars[i];
                chars[index++] = cur;
            }
        }
        if (times > 1) {
            char[] arr = String.valueOf(times).toCharArray();
            for (char c : arr) {
                chars[index++] = c;
            }
        }
        return Arrays.copyOfRange(chars, 0, index);
    }
}