Problem 2. Emoji Detector

Проблемът е, че не нулирате променливата sumCharEmoji винаги, а само когато е по-гляма от coolThreshold:

        long sumCharEmoji = 0;
        for (String s : emojiList) {
            for (int i = 0; i < s.length(); i++) {
                char ch = s.charAt(i);
                if (Character.isLetter(ch)) {
                    sumCharEmoji += s.charAt(i);
                }
            }
            if (sumCharEmoji >= sum) {
                System.out.println(s);
                sumCharEmoji = 0; // BUG!!!
            }
 
        }

Променете кода така и ще вземе 100/100:

        long sumCharEmoji = 0L;
        for (String s : emojiList) {
            sumCharEmoji = 0L; // proper initialization
            for (int i = 0; i < s.length(); i++) {
                char ch = s.charAt(i);
                if (Character.isLetter(ch)) {
                    sumCharEmoji += s.charAt(i);
                }
            }
            if (sumCharEmoji >= sum) {
                System.out.println(s);
            }
        }

Ето и алтернативно решение на задачата:

import java.util.List;
import java.util.Scanner;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

public class EmojiDetector {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String text = scanner.nextLine();

        List<String> emojiList = Pattern.compile("(:{2}|\\*{2})[A-Z][a-z]{2,}\\1")
                .matcher(text)
                .results()
                .map(MatchResult::group)
                .collect(Collectors.toList());

        long coolThreshold = Pattern.compile("\\d")
                .matcher(text)
                .results()
                .mapToLong(matchResult -> Long.parseLong(matchResult.group()))
                .reduce(1L, (a, b) -> a * b);

        System.out.printf("Cool threshold: %d%n", coolThreshold);
        System.out.printf("%d emojis found in the text. The cool ones are:%n", emojiList.size());

        long finalCoolThreshold = coolThreshold;
        emojiList.stream()
                .filter(emoji -> emoji.substring(2, emoji.length() - 2).chars().sum() >= finalCoolThreshold)
                .forEach(System.out::println);
    }
}