Code optimizations

- use prefix `++` and `--`
- removed obsolete braces

src/lib/algorithm/sort/quick.cpp

@@ -3,9 +3,7 @@
 namespace c0ding::algorithm {
   template<class T>
   void quick::sort(std::vector<T>& list) {
-    if (list.size() > 1) {
+    if (list.size() > 1) _quick<T>(list.begin(), --list.end());
-      _quick<T>(list.begin(), --list.end());
-    }
   }
 
   template<class T>
@@ -16,25 +14,17 @@ namespace c0ding::algorithm {
     const long pivot = *mid;
 
     while (std::distance(i, j) >= 0) {
-      while (*i < pivot) {
+      while (*i < pivot) ++i;
-        i++;
+      while (*j > pivot) --j;
-      }
+
-      while (*j > pivot) {
-        j--;
-      }
       if (std::distance(i, j) >= 0) {
         std::iter_swap(i, j);
-        i++;
+        ++i;
-        j--;
+        --j;
       }
     }
 
-    if (std::distance(left, j) > 0) {
+    if (std::distance(left, j) > 0) _quick<T>(left, j);
-      _quick<T>(left, j);
+    if (std::distance(i, right) > 0) _quick<T>(i, right);
-    }
-
-    if (std::distance(i, right) > 0) {
-      _quick<T>(i, right);
-    }
   }
 }