cleanup

d08.cc

@@ -21,7 +21,7 @@ Input parse()
 unsigned p1(const Input &trees)
 {
     int height = trees.size();
-    int width = trees[0].size();
+    int width = trees.front().size();
 
     // C++ is nice except when it isn't
     bool (*vis)[width] = (bool (*)[width])new bool[width * height];
@@ -78,7 +78,7 @@ unsigned p1(const Input &trees)
 unsigned p2(const Input &trees)
 {
     int height = trees.size();
-    int width = trees[0].size();
+    int width = trees.front().size();
 
     unsigned score = 0;
     for (int y = 1; y < height - 1; y++) {