Day 13

2022-12-07 09:09:48 -05:00
parent c432d3f381
commit aa4a1076a2
2 changed files with 203 additions and 0 deletions
@@ -0,0 +1,79 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <set>
+#include <utility>
+
+using namespace std;
+
+set<pair<int,int>> flip_about(set<pair<int,int>> input_points, bool x_flip, int value);
+
+int main(int argc, char* argv[])
+{
+    string line;
+    bool coord_input = true;
+    set<pair<int,int>> coords;
+    vector<pair<bool,int>> folds;
+    while(getline(cin, line))
+    {
+        if (0 == line.size())
+        {
+            coord_input = false;
+            continue;
+        }
+
+        if (coord_input)
+        {
+            string::size_type n = line.find(',');
+            pair<int,int> coord(stoi(line.substr(0,n)), stoi(line.substr(n+1)));
+            coords.insert(coord);
+        }
+        else
+        {
+            string::size_type n = line.find_last_of(' ');
+            line = line.substr(n+1);
+            pair<bool,int> fold(line[0]=='x', stoi(line.substr(2)));
+            folds.push_back(fold);
+        }
+    }
+
+
+    coords = flip_about(coords, folds[0].first, folds[0].second);
+
+    cout << coords.size() << endl;
+}
+
+set<pair<int,int>> flip_about(set<pair<int,int>> input_points, bool x_flip, int value)
+{
+    set<pair<int,int>> output_points;
+    set<pair<int,int>>::iterator it = input_points.begin();
+    for(; it != input_points.end(); ++it)
+    {
+        if (x_flip)
+        {
+            if (it->first > value)
+            {
+                pair<int,int> flipped_coord(2*value-it->first, it->second);
+                output_points.insert(flipped_coord);
+            }
+            else
+            {
+                output_points.insert(*it);
+            }
+        }
+        else
+        {
+            if (it->second > value)
+            {
+                pair<int,int> flipped_coord(it->first, 2*value-it->second);
+                output_points.insert(flipped_coord);
+            }
+            else
+            {
+                output_points.insert(*it);
+            }
+        }
+    }
+
+    return output_points;
+}