add: 220310 [cpp]

cpp/2203/220310.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+
+/**
+ * Definition for singly-linked list.
+ */
+struct ListNode {
+	int val;
+	ListNode* next;
+
+	explicit ListNode(int x = 0, ListNode* next = nullptr) : val(x), next(next) {}
+};
+
+class Solution {
+public:
+	static ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
+		if (!l1 || !l2)
+			return l1 ? l1 : l2;
+
+		int cin = (l1->val + l2->val) / 10;
+		ListNode* ret = new ListNode((l1->val + l2->val) % 10);
+		ListNode* ptr = ret;
+
+		for (ListNode* ptr1 = l1->next, * ptr2 = l2->next; ptr1 || ptr2; ) {
+			int cur = cin + (ptr1 ? l1->val : 0) + (ptr2 ? l2->val : 0);
+			ptr = ptr->next = new ListNode(cur % 10, nullptr);
+			cin = cur / 10;
+			ptr1 = ptr1 ? ptr1->next : nullptr;
+			ptr2 = ptr2 ? ptr2->next : nullptr;
+		}
+
+		if (cin)
+			ptr->next = new ListNode(cin, nullptr);
+		return ret;
+	}
+};

cpp/2203/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220310-CN.cpp)
+ADD_EXECUTABLE(2203 220310.cpp)