Submission #254759

#	Time	Username	Problem	Language	Result	Execution time	Memory
254759		model_code	Guess the number (BOI20_guess)	Java	100 / 100	110 ms	10528 KiB

Guess

import java.io.*;
import java.util.*;

public class Guess {

    static class Tokenizer extends StreamTokenizer {

        public Tokenizer(Reader r) {
            super(r);
            resetSyntax();
            whitespaceChars(0, ' ');
            wordChars(' '+1, 127);
            parseNumbers();
        }

        public int nextInt() throws IOException {
            return (int)nextDouble();
        }

        public long nextLong() throws IOException {
            return (long)nextDouble(); // Up to +/- 10^15
        }

        public double nextDouble() throws IOException {
            nextToken();
            return nval;
        }

        public String nextString() throws IOException {
            nextToken();
            return sval;
        }
    }

    public static void main(String[] args) throws IOException {
        Tokenizer in = new Tokenizer(new BufferedReader(new InputStreamReader(System.in)));
        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        int a = 1, b = in.nextInt();

        while (a < b) {
            int m = (a + b) / 2;
            out.print("? ");
            out.println(m);
            out.flush();

            int ans = in.nextInt();

            if (ans < 0) {
                a = m + 1;
            } else if (ans > 0) {
                b = m - 1;
            } else {
                a = b = m;
            }
        }

        out.print("= ");
        out.println(a);

        out.close();
    }

}

• Subtask 1: 29 / 29
• Subtask 2: 71 / 71