Developing Algorithms Using Strings

public static boolean isAna(String a, String b) {
  if (a.length() != b.length()) return false;
  int[] cnt = new int[26];
  for (char c : a.toCharArray()) cnt[c - 'a']++;
  for (char c : b.toCharArray()) cnt[c - 'a']--;
  for (int x : cnt) if (x != 0) return false;
  return true;
}
// call: isAna("abc", "bca")

• A

  true

  check_circle
• B

  0

• C

  false

• D

  exception