[백준] 17599 Bags - Data Structure / Java

graycode 2024. 3. 29. 12:12

• 문제 링크

17599번: Bags

Your friend Bob is a garbage collector working in a factory. The factory manufactures various kinds of chemical substances, and the toxic waste they may produce must be collected with caution. Every piece of toxic waste has an identifier that represents it

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• 풀이 코드

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashSet;
import java.util.Set;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        Set<Integer> set = new HashSet<>();
        int n = read();
        while (n-- > 0) set.add(read());

        bw.write(String.valueOf(set.size()));
        bw.flush();
    }

    private static int read() throws IOException {
        int c, n = System.in.read() & 15;
        while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);

        return n;
    }

}