Merge pull request #366 from AlgorithmWithGod/lkhyun

[20250617] BOJ / P5 / 상남자 곽철용 / 이강현

Author: ShinHeeEul

lkhyun/202506/17 BOJ P5 상남자 곽철용.md

@@ -0,0 +1,60 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N,M,K;
+    static HashSet<Integer> chosen;
+    static int cheolyoung;
+    static int answer = 0;
+
+    public static void main(String[] args) throws IOException {
+        st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+        K = Integer.parseInt(st.nextToken());
+        chosen = new HashSet<>();
+
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+            chosen.add(Integer.parseInt(st.nextToken()));
+            chosen.add(Integer.parseInt(st.nextToken()));
+        }
+        st = new StringTokenizer(br.readLine());
+        int a = Integer.parseInt(st.nextToken());
+        int b = Integer.parseInt(st.nextToken());
+        cheolyoung = Math.abs(a%K - b%K);
+
+        List<Integer> remainders = new ArrayList<>();
+        for (int i = 1; i <= 4*N; i++) {
+            if(!chosen.contains(i) && i != a && i != b) {
+                remainders.add(i % K);
+            }
+        }
+        Collections.sort(remainders);
+
+        int size = remainders.size();
+        int mid = size / 2;
+        int left = 0;
+        int right = mid;
+
+        while (left < mid && right < size) {
+            int diff = remainders.get(right) - remainders.get(left);
+
+            if (diff > cheolyoung) {
+                answer++;
+                left++;
+                right++;
+            } else {
+                right++;
+            }
+        }
+
+        bw.write(Math.min(answer, M - 1) + "\n");
+        bw.close();
+    }
+}
+```