From 79b905aea4bbe0c15c448f0af3f8cc733f763617 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Sat, 7 Dec 2024 07:51:09 +0100
Subject: Day 7 2024

---
 2024/07/day07a.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 2024/07/day07a.cpp

(limited to '2024/07/day07a.cpp')

diff --git a/2024/07/day07a.cpp b/2024/07/day07a.cpp
new file mode 100644
index 0000000..3b56dea
--- /dev/null
+++ b/2024/07/day07a.cpp
@@ -0,0 +1,34 @@
+#include <algorithm>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <vector>
+using namespace std;
+
+bool possible(long long x, vector<long long>& a, int i) {
+	if (i == 0)
+		return a[0] == x;
+	if (a[i] != 0 && x % a[i] == 0)
+		return possible(x/a[i], a, i-1) || possible(x-a[i], a, i-1);
+	return possible(x-a[i], a, i-1);
+}
+
+int main() {
+	string line;
+	long long tot = 0;
+	while (getline(cin, line)) {
+		long long x, i;
+		vector<long long> a;
+		stringstream s(line);
+		s >> x;
+		char colon;
+		s >> colon;
+		while (s >> i)
+			a.push_back(i);
+		if (possible(x, a, a.size()-1))
+			tot += x;
+	}
+	cout << tot << endl;
+	return 0;
+}
-- 
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