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IsAnonymousLetterConstructible.java
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IsAnonymousLetterConstructible.java
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package epi;
import epi.test_framework.EpiTest;
import epi.test_framework.GenericTest;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
public class IsAnonymousLetterConstructible {
@EpiTest(testDataFile = "is_anonymous_letter_constructible.tsv")
public static boolean isLetterConstructibleFromMagazine(String letterText,
String magazineText) {
// Compute the frequencies for all chars in letterText.
Map<Character, Long> charFrequencyForLetter =
letterText.chars()
.mapToObj(c -> (char)c)
.collect(Collectors.groupingBy(Function.identity(),
Collectors.counting()));
// Check if the characters in magazineText can cover characters in
// letterText.
for (char c : magazineText.toCharArray()) {
if (charFrequencyForLetter.containsKey(c)) {
charFrequencyForLetter.put(c, charFrequencyForLetter.get(c) - 1);
if (charFrequencyForLetter.remove(c, 0L)) {
charFrequencyForLetter.remove(c);
// All characters for letterText are matched.
if (charFrequencyForLetter.isEmpty()) {
break;
}
}
}
}
// Empty charFrequencyForLetter means every char in letterText can be
// covered by a character in magazineText.
return charFrequencyForLetter.isEmpty();
}
public static void main(String[] args) {
System.exit(
GenericTest
.runFromAnnotations(args, "IsAnonymousLetterConstructible.java",
new Object() {}.getClass().getEnclosingClass())
.ordinal());
}
}