## Monday, 12 October 2015

### Check if two given strings are isomorphic to each other

Check if two given strings are isomorphic to each other

Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t.

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.

For example,
Given "foo", "bar", return false.
Given "paper", "title", return true.

public class TestIsomorphic {
public static void main(String[] args) {
String str1 = "abb";
String str2 = "axx";
boolean res = TestIsomorphic.checkIsomorphic(str1,str2);
System.out.println(res);
}

static boolean checkIsomorphic(String str1, String str2) {
int length = str1.length();
/* length of both strings must be same */
if (length != str2.length()) {
return false;
}

// To mark visited characters in str2
char visited[] = new char[26];
for (int i = 0; i < visited.length; i++) {
visited[i] = '#';
}

char[] strArr1 = str1.toCharArray();
char[] strArr2 = str2.toCharArray();

// Process all characters one by on
for (int i = 0; i<length; i++) {
char ch = visited[strArr1[i]-'a'];
if(ch=='#') {
visited[strArr1[i]-'a'] = strArr2[i];
} else if (ch != strArr2[i]) {
return false;
}
}
return true;
}
}
Output: true

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