[20250721] BOJ / G4 / 공유기 설치 / 이준희

JHLEE325/202507/21 BOJ G4 공유기 설치.md

@@ -0,0 +1,60 @@
+```java
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class Main {
+
+    static int n, c;
+    static int[] house;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+
+        st = new StringTokenizer(br.readLine());
+        n = Integer.parseInt(st.nextToken());
+        c = Integer.parseInt(st.nextToken());
+
+        house = new int[n];
+        for (int i = 0; i < n; i++) {
+            house[i] = Integer.parseInt(br.readLine());
+        }
+
+        Arrays.sort(house);
+
+        int low = 1;
+        int high = house[n - 1] - house[0];
+        int answer = 0;
+
+        while (low <= high) {
+            int mid = (low + high) / 2;
+
+            if (canInstall(mid)) {
+                answer = mid;
+                low = mid + 1;
+            } else {
+                high = mid - 1;
+            }
+        }
+
+        System.out.println(answer);
+    }
+
+    static boolean canInstall(int distance) {
+        int count = 1;
+        int lastInstalled = house[0];
+
+        for (int i = 1; i < n; i++) {
+            if (house[i] - lastInstalled >= distance) {
+                count++;
+                lastInstalled = house[i];
+            }
+        }
+
+        return count >= c;
+    }
+}
+
+```