第二题AC40% 帮忙看下哪里出错了 public static String solution(long n, int m) { String str = String.valueOf(n); if (m >= str.length()) { return null; } for (int i = 0; i < str.length() - 1; i++) { if (str.charAt(i) < str.charAt(i+1)) { str = str.replaceFirst(String.valueOf(str.charAt(i)), ""); m--; i = -1; } if (m <= 0) { break; } } String result =""; if (m > 0) { char[] temp = str.toCharArray(); for (int i = 0; i < temp.length - m; i++) { result += temp[i]; } }else { result = str; } return result; }