LeetCode in Net

242. Valid Anagram

Easy

Given two strings s and t, return true if t is an anagram of s, and false otherwise.

Example 1:

Input: s = “anagram”, t = “nagaram”

Output: true

Example 2:

Input: s = “rat”, t = “car”

Output: false

Constraints:

• 1 <= s.length, t.length <= 5 * 104
• s and t consist of lowercase English letters.

Follow up: What if the inputs contain Unicode characters? How would you adapt your solution to such a case?

Solution

public class Solution {
    public bool IsAnagram(string s, string t) {
        if (s.Length != t.Length) {
            return false;
        }
        int[] charFreqMap = new int[26];
        foreach (char c in s) {
            charFreqMap[c - 'a']++;
        }
        foreach (char c in t) {
            if (charFreqMap[c - 'a'] == 0) {
                return false;
            }
            charFreqMap[c - 'a']--;
        }
        return true;
    }
}

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