add 19

0019.h

@@ -0,0 +1,28 @@
+#include "common.h"
+
+namespace s0019 {
+    //  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* removeNthFromEnd(ListNode* head, int n) {
+            ListNode *dummyHead = new ListNode(0, head);
+            ListNode *slow = dummyHead, *fast = dummyHead;
+            while (n--) fast = fast->next;
+            fast = fast->next;
+            while (fast) {
+                fast = fast->next;
+                slow = slow->next;
+            }
+            slow->next = slow->next->next;
+
+            return dummyHead->next;
+        }
+    };
+}

CMakeLists.txt

@@ -8,18 +8,18 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 set(src_list test.cc)
 include(FetchContent)
 
-FetchContent_Declare(
-    fmt
-    GIT_REPOSITORY https://github.com/fmtlib/fmt.git
-    GIT_TAG master
-)
+#FetchContent_Declare(
+#    fmt
+#    GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+#    GIT_TAG master
+#)
 FetchContent_Declare(
     googletest
     GIT_REPOSITORY https://github.com/google/googletest.git
     GIT_TAG main
 )
 
-FetchContent_MakeAvailable(fmt googletest)
+FetchContent_MakeAvailable(googletest)
 
 # add the executable
 add_executable(${PROJECT_NAME} ${src_list})
@@ -29,6 +29,6 @@ target_include_directories(${PROJECT_NAME} PUBLIC
                            )
 target_link_libraries(${PROJECT_NAME}
     PRIVATE
-        fmt::fmt
+        #fmt::fmt
         gtest_main
 )