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How to check whether the given strings are isomorphic using C#?
Two strings, X and Y, are called isomorphic if all occurrences of each character in X can be replaced with another character to get Y and vice-versa. For example, consider strings ACAB and XCXY. All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself.
Example 1
Input − s = "egg", t = "add"
Output − true
Example 2
Input − s = "foo", t = "bar"
Output − false
Time complexity − O(N)
Space complexity − O(N)
code
public class Arrays{
public bool IsStringIsomorphic(string s, string t){
if (s == null || t == null){
return false;
}
int[] chars1 = new int[128];
int[] chars2 = new int[128];
for (int i = 0; i < s.Length; i++){
if (chars1[s[i]] != chars2[t[i]]){
return false;
}
else{
chars1[s[i]] = i + 1;
chars2[t[i]] = i + 1;
}
}
return true;
}
}
static void Main(string[] args){
Console.WriteLine(s.IsStringIsomorphic("add", "egg"));
}Output
True
Updated on: 17-Aug-2021
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