1 files changed, 30 insertions, 0 deletions

diff --git a/2024/02/day02a.cpp b/2024/02/day02a.cpp
new file mode 100644
index 0000000..cdd9efa
--- /dev/null
+++ b/2024/02/day02a.cpp
@@ -0,0 +1,30 @@
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <algorithm>
+#include <string>
+using namespace std;
+
+bool isvalid(const string &line) {
+        int x, y, b;
+        istringstream s(line);
+
+        s >> x >> y;
+        b = x > y ? 1 : -1;
+        do {
+                int d = b * (x-y);
+                if (d < 1 || d > 3)
+                        return false;
+                x = y;
+        } while (s >> y);
+
+        return true;
+}
+
+int main() {
+        int tot = 0;
+        for (string line; getline(cin, line); )
+                tot += isvalid(line);
+        cout << tot << endl;
+        return 0;
+}