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  • 205. Isomorphic Strings

    https://leetcode.com/problems/isomorphic-strings/description/

    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 "egg""add", return true.

    Given "foo""bar", return false.

    Given "paper""title", return true.

    Note:
    You may assume both s and t have the same length.

    Sol:

    public class Solution {
        public boolean isIsomorphic(String s, String t) {
            // Time O(n) Space O(n)
            
            if (s.length() != t.length()) return false;
            
            final Map<Character, Character> map1 = new HashMap<>();
            final Map<Character, Character> map2 = new HashMap<>();
            
            for (int i = 0; i < s.length(); i++){
                final char c1 = s.charAt(i);
                final char c2 = t.charAt(i);
                
                if (map1.containsKey(c1)){
                    if (map1.get(c1) != c2) return false;
                } else {
                    map1.put(c1, c2);
                }
                
                if (map2.containsKey(c2)){
                    if (map2.get(c2) != c1) return false;
                } else {
                    map2.put(c2, c1);
                }
                
                
            }
            
            return true;
            
        }
    }
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  • 原文地址:https://www.cnblogs.com/prmlab/p/7295357.html
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