[20251022] BOJ / G4 / 댄스 파티 / 김수연

suyeun84/202510/22 BOJ G4 댄스 파티.md

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+```java
+import java.io.*;
+import java.util.*;
+
+public class boj2831 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static void nextLine() throws Exception { st = new StringTokenizer(br.readLine()); }
+    static int nextInt() { return Integer.parseInt(st.nextToken()); }
+
+    public static void main(String[] args) throws Exception {
+        nextLine();
+        int N = nextInt();
+        int answer = 0;
+        ArrayList<Integer> tg = new ArrayList<>();
+        ArrayList<Integer> sg = new ArrayList<>();
+        ArrayList<Integer> tb = new ArrayList<>();
+        ArrayList<Integer> sb = new ArrayList<>();
+        nextLine();
+        for (int i = 0; i < N; i++) {
+            int tmp = nextInt();
+            if (tmp < 0) sg.add(tmp*-1);
+            else tg.add(tmp);
+        }
+        nextLine();
+        for (int i = 0; i < N; i++) {
+            int tmp = nextInt();
+            if (tmp < 0) sb.add(tmp*-1);
+            else tb.add(tmp);
+        }
+        // 양수 -> 자신보다 큰, 음수 -> 자신보다 작은
+        Collections.sort(tg);
+        Collections.sort(sg);
+        Collections.sort(tb);
+        Collections.sort(sb);
+
+        for (int i = 0, j = 0; i < tb.size() && j < sg.size();) {
+            int man = tb.get(i); // 큰여자원하는남자
+            int woman = sg.get(j); //작은남자원하는여자
+            if (woman <= man) j++;
+            else {
+                i++;
+                j++;
+                answer++;
+            }
+        }
+        for (int i = 0, j = 0; i < sb.size() && j < tg.size();) {
+            int man = sb.get(i); //작은여자원하는남자
+            int woman = tg.get(j); //큰남자원하는여자
+            if (man <= woman) i++;
+            else {
+                i++;
+                j++;
+                answer++;
+            }
+        }
+        System.out.println(answer);
+    }
+}
+```