From bcb6761f4d5eee3c998932fb71249f14c0477069 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Sat, 1 Oct 2022 13:38:18 +0800
Subject: [PATCH] =?UTF-8?q?P2508=20[HAOI2008]=E5=9C=86=E4=B8=8A=E7=9A=84?=
 =?UTF-8?q?=E6=95=B4=E7=82=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

https://www.luogu.com.cn/record/88070866
---
 Luogu/P2508/P2508.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Luogu/P2508/P2508.cpp

diff --git a/Luogu/P2508/P2508.cpp b/Luogu/P2508/P2508.cpp
new file mode 100644
index 00000000..849ece35
--- /dev/null
+++ b/Luogu/P2508/P2508.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    long long r, ans = 1;
+
+    cin >> r;
+
+    for (int i = 2; i * i <= r; i++) {
+        if (r % i == 0) {
+            int cnt = 0;
+
+            while (r % i == 0) {
+                r /= i;
+                cnt++;
+            }
+
+            if (i % 4 == 1) ans *= cnt * 2 + 1;
+        }
+    }
+
+    if (r != 1 && r % 4 == 1) {
+        ans *= 3;
+    }
+
+    cout << ans * 4 << endl;
+
+    return 0;
+}