1 files changed, 15 insertions, 1 deletions
diff --git a/src/2022/day15/aoc.h b/src/2022/day15/aoc.h
index 87c3208..7540490 100644
--- a/src/2022/day15/aoc.h
+++ b/src/2022/day15/aoc.h
@@ -24,6 +24,8 @@ struct sensor {
     pos p0;
     pos p1;
 
+    line() {}
+    line(pos x, pos y): p0(x), p1(y) {}
     friend bool operator<(const line& l1, const line& l2) {
       return l1.p0.x < l2.p0.x;
     }
@@ -39,6 +41,18 @@ struct sensor {
     return std::abs(p1.x - p2.x) + std::abs(p1.y - p2.y);
   }
 
+  std::pair<int, std::vector<line>> lines() const noexcept {
+    auto d = mdistance(ps[0], ps[1]);
+    std::vector<line> ls;
+    for(int y = ps[0].y - d; y <= ps[0].y + d; y++) {
+      auto dx = d - std::abs(ps[0].y - y);
+      pos p0 = {ps[0].x - dx, y};
+      pos p1 = {ps[0].x + dx, y};
+      ls.emplace_back(p0, p1);
+    }
+    return {ps[0].y - d,ls};
+  }
+
   void get_number(const char** pp, int* d) {
     const char *p = *pp;
     int sign = 1;
@@ -83,6 +97,6 @@ struct sensor {
   }
 };
 
-std::pair<int, int> day15(line_view);
+std::pair<int, size_t> day15(line_view);
 }