1 files changed, 75 insertions, 1 deletions
diff --git a/src/2017/day21/aoc.h b/src/2017/day21/aoc.h
index c41c88a..fe2fc56 100644
--- a/src/2017/day21/aoc.h
+++ b/src/2017/day21/aoc.h
@@ -3,5 +3,79 @@
 #include <vector>
 
 namespace aoc2017 {
+
+struct square2 {
+  char s[4] = {0};
+
+  // ../..
+  square2(const std::string& ss) {
+    s[0] = *ss.data();
+    s[1] = *(ss.data() + 1);
+    s[2] = *(ss.data() + 3);
+    s[3] = *(ss.data() + 4);
+  }
+  std::vector<square2> flip() { return {}; }
+  std::vector<square2> rotate() { return {}; }
+  std::string to_string() {
+    char sx[6] = {0};
+    sprintf(sx, "%c%c/%c%c", s[0], s[1], s[2], s[3]);
+    return sx;
+  }
+};
+
+struct square3 {
+  char s[9] = {0};
+
+  // .../.../...
+  square3(const std::string& ss) {
+    s[0] = *ss.data();
+    s[1] = *(ss.data() + 1);
+    s[2] = *(ss.data() + 2);
+
+    s[3] = *(ss.data() + 4);
+    s[4] = *(ss.data() + 5);
+    s[5] = *(ss.data() + 6);
+
+    s[6] = *(ss.data() + 8);
+    s[7] = *(ss.data() + 9);
+    s[8] = *(ss.data() + 10);
+  }
+  std::vector<square3> flip() { return {}; }
+  std::vector<square3> rotate() { return {}; }
+  std::string to_string() {
+    char sx[12] = {0};
+    sprintf(sx, "%c%c%c/%c%c%c/%c%c%c", s[0], s[1], s[2], s[3], s[4], s[5], s[6], s[7], s[8]);
+    return sx;
+  }
+};
+
+struct square4 {
+  char s[16] = {0};
+
+  // ##../#.../..../..#.
+  square4(const std::string& ss) {
+    s[0] = *ss.data();
+    s[1] = *(ss.data() + 1);
+    s[2] = *(ss.data() + 2);
+    s[3] = *(ss.data() + 3);
+
+    s[4] = *(ss.data() + 5);
+    s[5] = *(ss.data() + 6);
+    s[6] = *(ss.data() + 7);
+    s[7] = *(ss.data() + 8);
+
+    s[8] = *(ss.data() + 10);
+    s[9] = *(ss.data() + 11);
+    s[10] = *(ss.data() + 12);
+    s[11] = *(ss.data() + 13);
+
+    s[12] = *(ss.data() + 15);
+    s[13] = *(ss.data() + 16);
+    s[14] = *(ss.data() + 17);
+    s[15] = *(ss.data() + 18);
+  }
+  std::vector<square2> partition() { return {}; }
+};
+
 std::pair<int64_t, int64_t> day21(line_view);
-}
+} // namespace aoc2017