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l33tcode_merge2sortedlists/Cpp/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+# Modify only these if one source file!
+project(Cppl33tcode_merge2sortedlists)
+set(CURRENT_PROJECT_CODE_NAME l33tcode_merge2sortedlists)
+set(FILE_EXT cpp)
+# End
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED True)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+# We want all the warnings and as errors enabled
+if (MSVC)
+    # warning level 4 and all warnings as errors
+    add_compile_options(/W4 /WX)
+else()
+    # lots of warnings and all warnings as errors
+    add_compile_options(-Wall -Wextra -pedantic -Werror)
+endif()
+
+add_executable(${CMAKE_PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR}/${CURRENT_PROJECT_CODE_NAME}.${FILE_EXT})
+
+target_include_directories(${CMAKE_PROJECT_NAME} PUBLIC
+					    ${EXTRA_INCLUDES}
+						)
+
+target_link_libraries(${CMAKE_PROJECT_NAME} PUBLIC 
+						${EXTRA_LIBS}
+						)
+						
+

l33tcode_merge2sortedlists/Cpp/l33tcode_merge2sortedlists.cpp

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+// Merge2SortedLists.cpp : This file contains the 'main' function. Program execution begins and ends there.
+//
+
+#include <iostream>
+
+struct ListNode {
+    int val;
+    ListNode* next;
+    ListNode() : val(0), next(nullptr) {}
+    ListNode(int x) : val(x), next(nullptr) {}
+    ListNode(int x, ListNode* next) : val(x), next(next) {}
+    
+};
+
+/**
+ * Definition for singly-linked list.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode() : val(0), next(nullptr) {}
+ *     ListNode(int x) : val(x), next(nullptr) {}
+ *     ListNode(int x, ListNode *next) : val(x), next(next) {}
+ * };
+ */
+class Solution {
+public:
+    ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {
+        ListNode* head = nullptr;
+
+        if (l1 && l2 && l1->val < l2->val)
+        {
+            head = l1;
+            l1 = l1->next;
+            head->next = nullptr;
+        }
+        else if (l2)
+        {
+            head = l2;
+            l2 = l2->next;
+            head->next = nullptr;
+        }
+
+        ListNode* newList = head;
+
+        if (l1 && l2)
+        {
+            while (l1 != nullptr && l2 != nullptr)
+            {
+                if (l1->val < l2->val)
+                {
+                    newList->next = l1;
+                    l1 = l1->next;
+                    newList = newList->next;
+                    newList->next = nullptr;
+                }
+                else
+                {
+                    newList->next = l2;
+                    l2 = l2->next;
+                    newList = newList->next;
+                    newList->next = nullptr;
+                }
+            }
+        }
+
+        while (l1 != nullptr)
+        {
+            newList->next = l1;
+            newList = newList->next;
+            newList->next = nullptr;
+        }
+
+        while (l2 != nullptr)
+        {
+            newList->next = l2;
+            newList = newList->next;
+            newList->next = nullptr;
+        }
+
+        return head;
+    }
+};
+
+int main()
+{
+    Solution s;
+    s.mergeTwoLists(nullptr, nullptr);
+
+    ListNode *one = new ListNode(4);
+    ListNode* two = new ListNode(2, one);
+    ListNode* three = new ListNode(1, two);
+
+    ListNode* one1 = new ListNode(4);
+    ListNode* two1 = new ListNode(3, one);
+    ListNode* three1 = new ListNode(1, two);
+
+    s.mergeTwoLists(three, three1);
+
+    std::cout << "Hello World!\n";
+}
+
+// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
+// Debug program: F5 or Debug > Start Debugging menu
+
+// Tips for Getting Started: 
+//   1. Use the Solution Explorer window to add/manage files
+//   2. Use the Team Explorer window to connect to source control
+//   3. Use the Output window to see build output and other messages
+//   4. Use the Error List window to view errors
+//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
+//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file