From 325117d6949f7bf2900d5f4d6a118f3e3b6b2501 Mon Sep 17 00:00:00 2001
From: Federico Igne <undyamon@disroot.org>
Date: Wed, 6 Dec 2023 14:28:33 +0100
Subject: aoc(2306): Wait For It

---
 2023/06/src/part1.cpp | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 2023/06/src/part1.cpp

(limited to '2023/06/src/part1.cpp')

diff --git a/2023/06/src/part1.cpp b/2023/06/src/part1.cpp
new file mode 100644
index 0000000..2d50385
--- /dev/null
+++ b/2023/06/src/part1.cpp
@@ -0,0 +1,54 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <cstring>
+#include <vector>
+#include <cmath>
+
+int main(void)
+{
+    int answer{ 1 };
+    std::vector<int> time;
+    std::vector<int> distance;
+
+    std::ifstream input{ "resources/input.txt" };
+    if (input.is_open())
+    {
+        int n;
+        std::string line;
+
+        /* Time */
+        {
+            std::getline(input,line);
+            line.erase(0, std::strlen("Time:"));
+            std::istringstream sline{ line };
+            while(sline >> n)
+            {
+                time.push_back(n);
+            }
+        }
+
+        /* Distance */
+        {
+            std::getline(input,line);
+            line.erase(0, std::strlen("Distance:"));
+            std::istringstream sline{ line };
+            while(sline >> n)
+            {
+                distance.push_back(n);
+            }
+        }
+    }
+    input.close();
+
+    for (int i = 0; i < time.size(); ++i)
+    {
+        double delta = std::sqrt(time[i] * time[i] - 4 * distance[i]);
+        int from{ static_cast<int>(1 + (time[i] - delta) / 2)};
+        int to{ static_cast<int>(std::ceil((time[i] + delta) / 2)) };
+        answer *= to - from;
+    }
+
+    std::cout << answer << std::endl;
+    return 0;
+}
-- 
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