From c5b4420399e2596418b05c1867f3e78e52f0fb1e Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Wed, 17 Jun 2026 00:46:01 +0800
Subject: [42] apple

---
 42/apple.cc | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 42/apple.cc

diff --git a/42/apple.cc b/42/apple.cc
new file mode 100644
index 0000000..b9cce28
--- /dev/null
+++ b/42/apple.cc
@@ -0,0 +1,40 @@
+#include <bits/stdc++.h>
+#include <cstdint>
+using namespace std;
+
+uint64_t n, k, m;
+
+bool can_live(uint64_t robot_num) {
+  uint64_t total_apple = n;
+  for (int day = 1; day <= m; ++day) {
+    uint64_t rot = (total_apple * k + 99) / 100;
+    total_apple -= rot;
+    if (total_apple < robot_num) {
+      return false;
+    }
+    total_apple -= robot_num;
+  }
+  return true;
+}
+
+int main() {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+  cin >> n >> k >> m;
+
+  uint64_t left = 0;
+  uint64_t right = n / m;
+  uint64_t res = 0;
+
+  while (left <= right) {
+    uint64_t mid = left + (right - left) / 2;
+    if (can_live(mid)) {
+      res = mid;
+      left = mid + 1;
+    } else {
+      right = mid - 1;
+    }
+  }
+  cout << res << "\n";
+  return 0;
+}
-- 
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