[Java] BOJ 19583 싸이버개강총회

19583번: 싸이버개강총회

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정답 코드

• 문자열 처리 + 조건문 + 해싱
• Window 터미널에서 EOF 입력 방법 : [ctrl + z]

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

public class Main {

    static BufferedReader br;
    static BufferedWriter bw;
    static StringTokenizer st;
    static HashSet<String> set;

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

        st = new StringTokenizer(br.readLine(), " ");
        String s = st.nextToken();
        String e = st.nextToken();
        String f = st.nextToken();

        int sTime = StringToTime(s);
        int eTime = StringToTime(e);
        int fTime = StringToTime(f);

        String str = "";
        set = new HashSet<>();
        int cnt = 0;
        while ((str = br.readLine()) != null) {
            st = new StringTokenizer(str, " ");
            String t = st.nextToken();
            String name = st.nextToken();

            int nTime = StringToTime(t);

            if (nTime <= sTime) {
                set.add(name);
            }

            if (eTime <= nTime && nTime <= fTime) {
                if (set.contains(name)) {
                    set.remove(name);
                    cnt++;
                }
            }
        }
        System.out.println(cnt);
    }

    private static int StringToTime(String str) {
        st = new StringTokenizer(str, ":");
        return Integer.parseInt(st.nextToken()) * 60 + Integer.parseInt(st.nextToken());
    }
}