[20250716] BOJ / G4 / 휴게소 세우기 / 이인희

LiiNi-coder/202507/16 BOJ 휴게소 세우기.md

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+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B1477 {
+	private static BufferedReader br;
+	private static int n;
+	private static int l;
+	private static int[] positions;
+	private static int m;
+
+	public static void main(String[] args) throws IOException {
+		br = new BufferedReader(new InputStreamReader(System.in));
+		String[] temp = br.readLine().split(" ");
+		n = Integer.parseInt(temp[0]);
+		m = Integer.parseInt(temp[1]);
+		l = Integer.parseInt(temp[2]);
+
+		positions = new int[n + 2];
+		String[] line = br.readLine().split(" ");
+		for (int i = 0; i < n; i++) {
+			positions[i + 1] = Integer.parseInt(line[i]);
+		}
+		positions[0] = 0;
+		positions[n + 1] = l;
+
+		Arrays.sort(positions);
+
+		int left = 1;
+		int right = l;
+		int answer = 0;
+
+		while (left <= right) {
+			int mid = (left + right) / 2;
+			if (canBuild(mid)) {
+				answer = mid;
+				right = mid - 1;
+			} else {
+				left = mid + 1;
+			}
+		}
+
+		System.out.println(answer);
+	}
+
+	private static boolean canBuild(int maxDist) {
+		int needed = 0;
+		for (int i = 1; i < positions.length; i++) {
+			int dist = positions[i] - positions[i - 1];
+			// 해당 구간에서 몇 개의 휴게소가 필요한가?
+			if (dist > maxDist) {
+				needed += (dist - 1) / maxDist;
+			}
+		}
+		return needed <= m;
+	}
+}
+
+```