LeetCode/LeetCode/cpp/lc_0482.cpp at master · duycc/LeetCode · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
/**
 * @file     lc_0482.cpp
 * @brief    https://leetcode-cn.com/problems/license-key-formatting/
 * @author   YongDu
 * @date     2021-10-04
 */
class Solution {
  public:
    string licenseKeyFormatting(string s, int k) {
        if (s.empty()) {
            return string();
        }
        string result;
        int cnt = 0;
        for (int i = s.size() - 1; i >= 0; --i) {
            if (s[i] != '-') {
                result.push_back(std::toupper(s[i]));
                cnt++;
                if (cnt % k == 0) {
                    result.push_back('-');
                }
            }
        }
        if (result.back() == '-') {
            result.pop_back();
        }
        std::reverse(result.begin(), result.end());
        return result;
    }
};