백준/단계별: 회사에 있는 사람 문제풀이 (#20)

src/baekjoon/step/setsAndMap/PROB7785.java

@@ -0,0 +1,42 @@
+package baekjoon.step.setsAndMap;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class PROB7785 {
+    // 회사에 남아 있는 사람 구하고 사전순의 역순으로 출력
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static HashMap<String, String> map = new HashMap<>();
+    static List<String> names = new ArrayList<>();
+    static int N;
+    static String name;
+    static String status;
+
+
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        for (int i = 0; i < N; i ++) {
+            st = new StringTokenizer(br.readLine());
+            name = st.nextToken();
+            status = st.nextToken();
+
+            if (map.containsKey(name)) {
+                map.remove(name);
+            } else {
+                map.put(name, status);
+            }
+        }
+
+        map.forEach((key, value) -> names.add(key));
+
+        names.sort(Collections.reverseOrder());
+
+        for (String name : names) {
+            System.out.println(name);
+        }
+    }
+}