leetcode

0 class Solution {

1 static string valid4(const string &s) {

2 stringstream ss(s);

3 string crnt;

4 int cnt = 0;

5

6 while (getline(ss, crnt, '.')) {

7 if (size(crnt) == 0 || size(crnt) > 3) break;

8 if (any_of(begin(crnt), end(crnt), [](char c) { return isalpha(c); })) break;

9 if (size(crnt) > 1 && crnt[0] == '0') break;

10 if (stoi(crnt) >= 256) break;

11 cnt++;

12 }

13

14 return cnt == 4 ? "IPv4" : "Neither";

15 }

16

17 static string valid6(const string &s) {

18 stringstream ss(s);

19 string crnt;

20 int cnt = 0;

21

22 while (getline(ss, crnt, ':')) {

23 if (size(crnt) == 0 || size(crnt) > 4) break;

24 cnt++;

25 }

26

27 return cnt == 8 ? "IPv6" : "Neither";

28 }

29

30 public:

31 string validIPAddress(const string &queryIP) const {

32 int dot = 0, col = 0;

33

34 for (const char c : queryIP) {

35 if (c == '.')

36 dot++;

37 else if (c == ':')

38 col++;

39 else if (!isxdigit(c))

40 return "Neither";

41 }

42

43 if (dot && col) return "Neither";

44 if (dot ? dot != 3 : col != 7) return "Neither";

45

46 return dot ? valid4(queryIP) : valid6(queryIP);

47 }

48 };