From 633104e38f45250289ab245ec16967163b308218 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Sun, 22 Dec 2024 08:54:33 +0100
Subject: Day 22 2024, but it's slow

---
 2024/22/day22a.cpp | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 2024/22/day22a.cpp

(limited to '2024/22/day22a.cpp')

diff --git a/2024/22/day22a.cpp b/2024/22/day22a.cpp
new file mode 100644
index 0000000..b2adfdc
--- /dev/null
+++ b/2024/22/day22a.cpp
@@ -0,0 +1,32 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <map>
+#include <queue>
+#include <ranges>
+#include <set>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <vector>
+using namespace std;
+
+int64_t next(int64_t n) {
+	constexpr int64_t M = 16777216;
+	n = ((n*64) ^ n) % M;
+	n = ((n/32) ^ n) % M;
+	n = ((n*2048) ^ n) % M;
+	return n;
+}
+
+int main() {
+	int64_t s;
+	int64_t tot = 0;
+	while (cin >> s) {
+		for (int i = 0; i < 2000; i++)
+			s = next(s);
+		tot += s;
+	}
+	cout << tot << endl;
+	return 0;
+}
-- 
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