题解 | #二进制取反#

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 num string字符串 
     * @return string字符串
     */
    public String maxLexicographical (String num) {
        // write code here
        char[] str = num.toCharArray();
        for (int i = 0; i < str.length; i++){
            if (str[i] == '0'){
                while(i < str.length && str[i] == '0'){
                    str[i++] = '1';
                }
                break;
            }
        }
        num = "";
        for (int i = 0; i < str.length; i++){
            num += str[i];
        }
        return num;
    }
}