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import文です．
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package, import文まで含めた全文です．
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packageは必要に応じて変えてください．
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```Java
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package shiritori;
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import java.io.BufferedReader;
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12
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import java.util.List;
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import java.util.Random;
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public class Shiritori {
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private static final BufferedReader READER = new BufferedReader(
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new InputStreamReader(System.in));
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private static final List<String> DICTIONARY = Collections
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.unmodifiableList(Arrays.asList("りんご", "ごりら", "らっぱ","ぱんつ","つくし", "しりとり","しめじ"));
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private static final List<String> USED = new ArrayList<>();
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private static final Random RANDOM;
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static {
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try {
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RANDOM = SecureRandom.getInstanceStrong();
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException(e);
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}
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}
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public static void main(String[] args) throws IOException {
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String yours = DICTIONARY.get(RANDOM.nextInt(DICTIONARY.size()));
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System.out.println(new StringBuilder().append("じゃあねー最初は[").append(yours)
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.append(']').append("だよ"));
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for (;;) {
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final String mine = READER.readLine();
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if (mine.isEmpty()) {
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continue;
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}
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if(mine.equals("！")){
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System.out.println("へへん．勝ったー！");
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return;
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}
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if (yours.charAt(yours.length() - 1) != mine.charAt(0)) {
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System.out.println(new StringBuilder().append("その単語[")
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.append(yours.charAt(yours.length() - 1))
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.append("]で始まってないじゃん！"));
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continue;
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}
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if (!DICTIONARY.contains(mine)) {
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System.out.println("その単語知らない！知ってそうな単語を入力して！");
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continue;
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}
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if(USED.contains(mine)){
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System.out.println("その単語使ったよ！忘れたとはいわせないよ！");
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continue;
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}
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USED.add(mine);
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List<String> result = search(mine.charAt(mine.length() - 1));
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if (result.isEmpty()) {
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System.out.println("もうわかんない．負けたー");
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return;
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}
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yours = result.get(RANDOM.nextInt(result.size()));
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if(USED.contains(yours)){
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System.out.println(new StringBuilder().append('[').append(yours).append(']')
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.append("は言ったっけー．わかんない．まけたー"));
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return;
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}
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System.out.println(new StringBuilder().append("じゃあ[")
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.append(yours).append(']').append('！'));
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}
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}
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public static final List<String> search(char firstChar) {
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List<String> result = new ArrayList<>();
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for (String word : DICTIONARY) {
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if (word.charAt(0) == firstChar) {
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result.add(word);
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}
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}
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return result;
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}
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}
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```
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