h5开发环境_昆明装修公司哪家好_优化营商环境存在问题及整改措施_成都网站关键词推广优化

题目：

题解：

class Solution {public String licenseKeyFormatting(String s, int k) {StringBuilder ans = new StringBuilder();int cnt = 0;for (int i = s.length() - 1; i >= 0; i--) {if (s.charAt(i) != '-') {cnt++;ans.append(Character.toUpperCase(s.charAt(i)));if (cnt % k == 0) {ans.append("-");}}}if (ans.length() > 0 && ans.charAt(ans.length() - 1) == '-') {ans.deleteCharAt(ans.length() - 1);}return ans.reverse().toString();}
}