Merge pull request #745 from AlgorithmWithGod/suyeun84

[20250826] BOJ / G1 / 놀이 공원 / 김수연

Author: ShinHeeEul

suyeun84/202508/26 BOJ G1 놀이 공원.md

@@ -0,0 +1,59 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class boj1561 {
+    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());}
+
+    static long N;
+    static int M, max = 0;
+    static int[] time;
+    public static void main(String[] args) throws Exception {
+        nextLine();
+        N = nextInt();
+        M = nextInt();
+        time = new int[M+1];
+        nextLine();
+        for (int i = 1; i <= M; i++) {
+            time[i] = nextInt();
+            max = Math.max(max, time[i]);
+        }
+        if (N <= M) {
+            System.out.println(N);
+            return;
+        } else {
+            long t = search();
+
+            long cnt = M;
+            for (int i = 1; i <= M; i++)
+                cnt += (t - 1) / time[i];
+
+            for (int i = 1; i <= M; i++) {
+
+                if (t % time[i] == 0)
+                    cnt++;
+
+                if (cnt == N) {
+                    System.out.println(i);
+                    return;
+                }
+            }
+        }
+    }
+    static long search() {
+        long start = 0;
+        long end = N/M * max;
+        while (start <= end) {
+            long mid = (start + end) / 2;
+            long sum = M;
+            for (int i = 1; i <= M; i++) sum += mid / time[i];
+            if (sum < N) start = mid + 1;
+            else end = mid - 1;
+        }
+        return start;
+    }
+}
+```