花花酱 LeetCode 1108. Defanging an IP Address

Given a valid (IPv4) IP address, return a defanged version of that IP address.

A defanged IP address replaces every period "." with "[.]".

Example 1:

Input: address = "1.1.1.1"
Output: "1[.]1[.]1[.]1"

Example 2:

Input: address = "255.100.50.0"
Output: "255[.]100[.]50[.]0"

Constraints:

Solution: String

Time complexity: O(n)
Space complexity: O(n)

class Solution {

public:

string defangIPaddr(string address) {

string output;

for (const char c : address) {

if (c == '.') output += "[.]";

else output += c;

}

return output;

}

};

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