Minor fix to LRU cache (#5)

Author: KetchuppOfficial

01-basics/cache.hpp

@@ -12,10 +12,8 @@
 
 #pragma once
 
-#include <iterator>
 #include <list>
 #include <unordered_map>
-#include <vector>
 
 namespace caches {
 
@@ -43,8 +41,7 @@ template <typename T, typename KeyT = int> struct cache_t {
     }
 
     auto eltit = hit->second;
-    if (eltit != cache_.begin())
-      cache_.splice(cache_.begin(), cache_, eltit, std::next(eltit));
+    cache_.splice(cache_.begin(), cache_, eltit);
     return true;
   }
 };