Add includes of cassert

2021/puzzle-18-01.cc

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <string>
 #include <vector>
+#include <cassert>
 
 using UInt = unsigned long;
 
@@ -9,6 +10,7 @@ struct Item
   UInt value_;
   unsigned depth_;
 };
+
 using Items = std::vector<Item>;
 
 auto print1(Items::const_iterator begin, Items::const_iterator end, unsigned current_depth)

2021/puzzle-18-02.cc

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <string>
 #include <vector>
+#include <cassert>
 
 using UInt = unsigned long;
 
@@ -9,6 +10,7 @@ struct Item
   UInt value_;
   unsigned depth_;
 };
+
 using Items = std::vector<Item>;
 
 auto print1(Items::const_iterator begin, Items::const_iterator end, unsigned current_depth)

2021/puzzle-20-01.cc

@@ -1,10 +1,12 @@
+#include <cassert>
 #include <iostream>
 #include <string>
 #include <vector>
 
 struct State
 {
-  explicit State(std::string const& rules) : rules_(rules)
+  explicit State(std::string const& rules)
+    : rules_(rules)
   {
     assert(rules.size() == 512);
     assert(rules[0] == '.' || rules[511] == '.');

2021/puzzle-20-02.cc

@@ -1,10 +1,12 @@
+#include <cassert>
 #include <iostream>
 #include <string>
 #include <vector>
 
 struct State
 {
-  explicit State(std::string const& rules) : rules_(rules)
+  explicit State(std::string const& rules)
+    : rules_(rules)
   {
     assert(rules.size() == 512);
     assert(rules[0] == '.' || rules[511] == '.');

2021/puzzle-21-02.cc

@@ -1,3 +1,4 @@
+#include <cassert>
 #include <array>
 #include <iomanip>
 #include <iostream>
@@ -124,6 +125,7 @@ struct State
       get(new_scorex, scorey, new_posx, posy) += states;
     }
   }
+
   void move_player2(unsigned scorex, unsigned scorey, unsigned posx, unsigned posy, unsigned amount,
                     UInt states)
   {
@@ -148,6 +150,7 @@ private:
     return data_[scorey * target_score * loop_size * loop_size + scorex * loop_size * loop_size +
                  (posy - 1) * loop_size + (posx - 1)];
   }
+
   auto get(unsigned scorex, unsigned scorey, unsigned posx, unsigned posy) noexcept -> UInt&
   {
     return data_[scorey * target_score * loop_size * loop_size + scorex * loop_size * loop_size +

2021/puzzle-25-01.cc

@@ -1,3 +1,4 @@
+#include <cassert>
 #include <array>
 #include <iostream>
 #include <regex>