[BOJ] 3079 입국심사 (G5)

Author: uiop5809

박예진/3주차/260116.cpp

@@ -0,0 +1,47 @@
+//https://www.acmicpc.net/problem/3079
+
+#include <algorithm>
+#include <iostream>
+
+using namespace std;
+
+int M, N;
+long long Tk[100001]; // 각 심사대에서 심사를 하는데 걸리는 시간
+long long maxTime = 0;
+
+long long binary_search() {
+    long long start = 1;
+    long long end = M * maxTime; // M * Tk
+    long long res = M * maxTime;
+
+    while (start <= end) {
+        long long sum = 0; // 심사할 수 있는 친구들 수
+        long long mid = (start + end) / 2;
+
+        for (int i = 0; i < N; i++) {
+            sum += (mid / Tk[i]);
+            if (sum > M) break;
+        }
+
+        if (sum >= M) {
+            end = mid - 1;
+            res = min(res, mid);
+        }
+        else {
+            start = mid + 1;
+        }
+    }
+    return res;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(NULL), cout.tie(NULL);
+
+    cin >> N >> M;
+    for (int i = 0; i < N; i++) {
+        cin >> Tk[i];
+        maxTime = max(maxTime, Tk[i]);
+    }
+    cout << binary_search();
+}