From 4aebede600c180b51d0b6ded0e42ec8a4223283e Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Tue, 3 Dec 2024 07:56:46 +0100
Subject: Added day 3 (bleah)

---
 2024/03/day03a.cpp | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 2024/03/day03a.cpp

(limited to '2024/03/day03a.cpp')

diff --git a/2024/03/day03a.cpp b/2024/03/day03a.cpp
new file mode 100644
index 0000000..2fb04cf
--- /dev/null
+++ b/2024/03/day03a.cpp
@@ -0,0 +1,48 @@
+#include <algorithm>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <vector>
+using namespace std;
+
+int trymult(const string_view &s) {
+	if (s.substr(0, 4) != "mul(")
+		return 0;
+
+	auto t = s.substr(4, s.length()-4);
+
+	int x = 0, y = 0;
+	int i = 0;
+	for (; i < 3; i++)
+		if (t[i] >= '0' && t[i] <= '9')
+			x = (x*10) + t[i]-'0';
+		else break;
+	if (i == 0 || t[i] != ',')
+		return 0;
+	i++;
+	int j = 0;
+	for (; j < 3; j++)
+		if (t[i+j] >= '0' && t[i+j] <= '9')
+			y = (y*10) + t[i+j]-'0';
+		else break;
+	if (j == 0 || t[j+i] != ')')
+		return 0;
+	return x*y;
+}
+
+int mults(const string &line) {
+	int result = 0;
+	for (auto i = line.begin(); i != line.end(); i++)
+		result += trymult(string_view(i, line.end()));
+	return result;
+}
+
+int main() {
+	string line;
+	int result = 0;
+	while (cin >> line)
+		result += mults(line);
+	cout << result << endl;
+	return 0;
+}
-- 
cgit v1.3