[20251123] BOJ / G5 / 기타 레슨

Author: Ukj0ng

Ukj0ng/202511/23 BOJ G5 기타 레슨.md

@@ -0,0 +1,74 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static int[] lectures;
+    private static int N, M, min;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        int answer = binarySearch();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+        min = 10000;
+
+        lectures = new int[N];
+
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            lectures[i] = Integer.parseInt(st.nextToken());
+            min = Math.min(min, lectures[i]);
+        }
+    }
+
+    private static int binarySearch() {
+        int left = min;
+        int right = 1000000000;
+        int result = 0;
+
+        while (left <= right) {
+            int mid = left + (right - left) / 2;
+
+            if (valid(mid)) {
+                result = mid;
+                right = mid - 1;
+            } else {
+                left = mid + 1;
+            }
+        }
+
+        return result;
+    }
+
+    private static boolean valid(int target) {
+        int time = 0;
+        int count = 1;
+
+        for (int lecture : lectures) {
+            if (lecture > target) {
+                return false;
+            }
+            if (time + lecture <= target) {
+                time += lecture;
+            } else {
+                count++;
+                time = lecture;
+            }
+        }
+
+        return count <= M;
+    }
+}
+```