package strings;

/**
 * Wikipedia: https://en.wikipedia.org/wiki/Pangram
 */
public class Pangram {

 /**
 * Driver Code
 */
 public static void main(String[] args) {
 assert isPangram("The quick brown fox jumps over the lazy dog");
 assert !isPangram("The quick brown fox jumps over the azy dog"); /* not exists l character */
 }

 /**
 * Check if a string is a pangram string or not
 *
 * @param s string to check
 * @return {@code true} if given string is pangram, otherwise {@code false}
 */
 public static boolean isPangram(String s) {
 boolean[] marked = new boolean[26]; /* by default all letters don't exists */
 char[] values = s.toCharArray();
 for (char value : values) {
 if (Character.isLetter(value)) {
 int index = Character.isUpperCase(value) ? value - 'A' : value - 'a';
 marked[index] = true; /* mark current character exists */
 }
 }

 for (boolean b : marked) {
 if (!b) {
 return false;
 }
 }
 return true;
 }
}