Topic
- Sort
- Hash Table
Description
https://leetcode.com/problems/valid-anagram/
Given two strings s and t , write a function to determine if t is an anagram of s.
Example 1:
Input: s = "anagram", t = "nagaram"
Output: true
Example 2:
Input: s = "rat", t = "car"
Output: false
Note:
You may assume the string contains only lowercase alphabets.
Follow up:
What if the inputs contain unicode characters? How would you adapt your solution to such case?
Analysis
略
Submission
public class ValidAnagram {
public boolean isAnagram1(String s, String t) {
if (s == null || t == null || s.length() != t.length())
return false;
int[] array = new int[26];
for (int i = 0; i < s.length(); i++) {
array[s.charAt(i) - 'a']++;
}
for (int i = 0; i < t.length(); i++) {
array[t.charAt(i) - 'a']--;
}
for (int elem : array) {
if (elem != 0)
return false;
}
return true;
}
public boolean isAnagram2(String s, String t) {
char[] sChar = s.toCharArray();
char[] tChar = t.toCharArray();
Arrays.sort(sChar);
Arrays.sort(tChar);
return Arrays.equals(sChar, tChar);
}
}
Test
import static org.junit.Assert.*;
import org.junit.Test;
public class ValidAnagramTest {
@Test
public void test1() {
ValidAnagram obj = new ValidAnagram();
assertTrue(obj.isAnagram1("anagram", "nagaram"));
assertTrue(obj.isAnagram1("", ""));
assertFalse(obj.isAnagram1("rat", "car"));
}
@Test
public void test2() {
ValidAnagram obj = new ValidAnagram();
assertTrue(obj.isAnagram2("anagram", "nagaram"));
assertTrue(obj.isAnagram2("", ""));
assertFalse(obj.isAnagram2("rat", "car"));
assertFalse(obj.isAnagram2("aa", "bb"));
}
}