1 files changed, 48 insertions, 0 deletions

diff --git a/2024/02/day02b.cpp b/2024/02/day02b.cpp
new file mode 100644
index 0000000..2e3dcf4
--- /dev/null
+++ b/2024/02/day02b.cpp
@@ -0,0 +1,48 @@
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <algorithm>
+#include <string>
+using namespace std;
+
+bool isvalid_v(const vector<int> &v) {
+        int b = v[0] > v[1] ? 1 : -1;
+        for (unsigned i = 0; i < v.size()-1; i++) {
+                int d = b * (v[i] - v[i+1]);
+                if (d < 1 || d > 3)
+                        return false;
+        }
+        return true;
+}
+
+vector<int> getv(const string &line) {
+        int x;
+        vector<int> ret;
+        istringstream s(line);
+
+        while(s >> x)
+                ret.push_back(x);
+
+        return ret;
+}
+
+bool isvalid(const string &line) {
+        vector v0 = getv(line);
+        if (isvalid_v(v0))
+                return true;
+        for (unsigned i = 0; i < v0.size(); i++) {
+                vector v = v0;
+                v.erase(v.begin() + i);
+                if (isvalid_v(v))
+                        return true;
+        }
+        return false;
+}
+
+int main() {
+        int tot = 0;
+        for (string line; getline(cin, line); )
+                tot += isvalid(line);
+        cout << tot << endl;
+        return 0;
+}