提出 #43625129

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ソースコード 拡げる

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
	public static void main(String[] args) throws Exception {
		try (Scanner scanner = new Scanner(System.in)) {
			int n = scanner.nextInt();
			Set<String> set = new HashSet<>();
			Set<String> allSet = new HashSet<>();
			for (int i = 0; i < n; i++) {
				String s = scanner.next();
				StringBuilder builder = new StringBuilder();
				for (int j = s.length() - 1; j >= 0; j--) {
					builder.append(s.charAt(j));
				}
				String reverse = builder.toString();

				int size = allSet.size();
				allSet.remove(s);
				allSet.remove(reverse);
				int removeSize = allSet.size();
				if (size == removeSize) {
					set.add(s);
				}
				allSet.add(s);
				allSet.add(reverse);
			}

			System.out.println(set.size());
		}
	}
}

提出情報

ジャッジ結果