#160505 (Java21) No.491 10^9+1と回文

• 問題: No.491 10^9+1と回文
• ユーザー: zimpha
• 提出日時: 2017-03-29 21:39:14
• 言語: Java21 (openjdk 21)
• 結果: AC
• 実行時間: 55 ms / 1,000 ms
• コード長: 2,789 bytes
• コンパイル時間: 2,203 ms
• コンパイル使用メモリ: 78,848 KB
• 実行使用メモリ: 37,372 KB
• 最終ジャッジ日時: 2024-10-01 08:40:41
• 合計ジャッジ時間: 10,163 ms
• ジャッジサーバーID （参考情報）: judge5 / judge1

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	51 ms; 36,992 KB
testcase_01	AC	51 ms; 37,208 KB
testcase_02	AC	50 ms; 36,888 KB
testcase_03	AC	48 ms; 37,144 KB
testcase_04	AC	49 ms; 37,012 KB
testcase_05	AC	48 ms; 37,192 KB
testcase_06	AC	50 ms; 36,968 KB
testcase_07	AC	48 ms; 37,056 KB
testcase_08	AC	50 ms; 37,228 KB
testcase_09	AC	50 ms; 36,688 KB
testcase_10	AC	47 ms; 36,812 KB
testcase_11	AC	49 ms; 37,204 KB
testcase_12	AC	50 ms; 37,116 KB
testcase_13	AC	49 ms; 36,892 KB
testcase_14	AC	48 ms; 37,032 KB
testcase_15	AC	49 ms; 36,684 KB
testcase_16	AC	54 ms; 37,044 KB
testcase_17	AC	53 ms; 37,028 KB
testcase_18	AC	50 ms; 36,836 KB
testcase_19	AC	51 ms; 37,012 KB
testcase_20	AC	53 ms; 36,912 KB
testcase_21	AC	52 ms; 37,116 KB
testcase_22	AC	50 ms; 37,012 KB
testcase_23	AC	49 ms; 37,072 KB
testcase_24	AC	48 ms; 37,120 KB
testcase_25	AC	49 ms; 36,792 KB
testcase_26	AC	49 ms; 37,244 KB
testcase_27	AC	48 ms; 36,928 KB
testcase_28	AC	48 ms; 37,228 KB
testcase_29	AC	48 ms; 37,020 KB
testcase_30	AC	49 ms; 36,848 KB
testcase_31	AC	49 ms; 37,016 KB
testcase_32	AC	50 ms; 37,232 KB
testcase_33	AC	53 ms; 36,884 KB
testcase_34	AC	49 ms; 37,140 KB
testcase_35	AC	50 ms; 37,092 KB
testcase_36	AC	48 ms; 37,004 KB
testcase_37	AC	50 ms; 37,068 KB
testcase_38	AC	48 ms; 37,192 KB
testcase_39	AC	49 ms; 37,180 KB
testcase_40	AC	50 ms; 37,284 KB
testcase_41	AC	50 ms; 37,244 KB
testcase_42	AC	50 ms; 37,092 KB
testcase_43	AC	49 ms; 36,844 KB
testcase_44	AC	50 ms; 37,072 KB
testcase_45	AC	51 ms; 37,228 KB
testcase_46	AC	50 ms; 37,068 KB
testcase_47	AC	50 ms; 36,884 KB
testcase_48	AC	49 ms; 37,048 KB
testcase_49	AC	48 ms; 37,072 KB
testcase_50	AC	49 ms; 37,192 KB
testcase_51	AC	51 ms; 37,204 KB
testcase_52	AC	49 ms; 36,648 KB
testcase_53	AC	49 ms; 37,372 KB
testcase_54	AC	50 ms; 36,584 KB
testcase_55	AC	49 ms; 37,008 KB
testcase_56	AC	51 ms; 36,916 KB
testcase_57	AC	50 ms; 36,940 KB
testcase_58	AC	51 ms; 36,876 KB
testcase_59	AC	51 ms; 36,920 KB
testcase_60	AC	51 ms; 37,184 KB
testcase_61	AC	51 ms; 36,508 KB
testcase_62	AC	50 ms; 36,860 KB
testcase_63	AC	50 ms; 37,000 KB
testcase_64	AC	51 ms; 37,244 KB
testcase_65	AC	51 ms; 36,680 KB
testcase_66	AC	53 ms; 37,044 KB
testcase_67	AC	53 ms; 37,236 KB
testcase_68	AC	51 ms; 37,116 KB
testcase_69	AC	53 ms; 37,056 KB
testcase_70	AC	51 ms; 37,072 KB
testcase_71	AC	52 ms; 37,068 KB
testcase_72	AC	52 ms; 37,136 KB
testcase_73	AC	53 ms; 36,996 KB
testcase_74	AC	52 ms; 37,152 KB
testcase_75	AC	52 ms; 37,244 KB
testcase_76	AC	53 ms; 36,900 KB
testcase_77	AC	53 ms; 37,072 KB
testcase_78	AC	52 ms; 37,212 KB
testcase_79	AC	53 ms; 36,916 KB
testcase_80	AC	52 ms; 36,796 KB
testcase_81	AC	54 ms; 37,072 KB
testcase_82	AC	54 ms; 36,988 KB
testcase_83	AC	53 ms; 36,832 KB
testcase_84	AC	53 ms; 36,888 KB
testcase_85	AC	53 ms; 37,016 KB
testcase_86	AC	51 ms; 36,860 KB
testcase_87	AC	50 ms; 37,060 KB
testcase_88	AC	50 ms; 37,232 KB
testcase_89	AC	50 ms; 36,584 KB
testcase_90	AC	53 ms; 36,892 KB
testcase_91	AC	51 ms; 36,824 KB
testcase_92	AC	54 ms; 36,836 KB
testcase_93	AC	53 ms; 37,140 KB
testcase_94	AC	54 ms; 37,064 KB
testcase_95	AC	54 ms; 37,184 KB
testcase_96	AC	54 ms; 37,132 KB
testcase_97	AC	52 ms; 36,912 KB
testcase_98	AC	51 ms; 37,128 KB
testcase_99	AC	52 ms; 37,048 KB
testcase_100	AC	53 ms; 36,928 KB
testcase_101	AC	55 ms; 36,872 KB
testcase_102	AC	55 ms; 37,148 KB
testcase_103	AC	54 ms; 37,200 KB
testcase_104	AC	54 ms; 37,124 KB
testcase_105	AC	54 ms; 37,228 KB

ソースコード

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Chiaki.Hoshinomori
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task491 solver = new Task491();
        solver.solve(1, in, out);
        out.close();
    }

    static class Task491 {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            long n = in.nextLong();
            n = n / 1000000001;
            if (n == 0) {
                out.println(0);
            } else {
                int ret = 0;
                char[] s = new Long(n).toString().toCharArray();
                int[] pw = new int[10];
                pw[0] = 1;
                for (int i = 1; i < 10; i++) {
                    pw[i] = pw[i - 1] * 10;
                }
                for (int i = 1; i < s.length; ++i) {
                    ret += 9 * pw[(i + 1) / 2 - 1];
                }
                int now = 0;
                for (int i = 0; i < (s.length + 1) / 2; i++) {
                    now = now * 10 + s[i] - '0';
                    int coef = s[i] - '0';
                    int rest = (s.length + 1) / 2 - (i + 1);
                    if (i == 0) --coef;
                    ret += coef * pw[rest];
                }
                now *= pw[s.length - (s.length + 1) / 2];
                for (int i = 0; i < s.length - (s.length + 1) / 2; ++i) {
                    now += pw[i] * (s[i] - '0');
                }
                if (now <= n) ++ret;
                out.println(ret);
            }
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

    }
}