(1) Linked List:

• 2-add-two-numbers，2.cpp
• 19-remove-nth-node-from-end-of-list，TBD
• 21-merge-two-sorted-lists，TBD
• 83-remove-duplicates-from-sorted-list，83.cpp
• 141-linked-list-cycle，141.cpp，题解：判断单链表里面有没有环
• 160-intersection-of-two-linked-lists，160.cpp
• 203-remove-linked-list-elements，203.cpp
• 206-reverse-linked-list，206.cpp
• 234-palindrome-linked-list，234.cpp，题解：Palindrome Linked List 回文链表 和 如何判断一个单向链表是否为回文链表（Palindrome Linked List）

(2) Array/Vector:

• 27-remove-element，27.cpp，参考：vector初始化
• 41-first-missing-positive，TBD
• 48-rotate-image，48.cpp
• 54-spiral-matrix，54.cpp，参考：C++ vector用法
• 59-spiral-matrix-ii，59.cpp，参考：动态创建二维vector数组 C和C++ 及指针与引用的区别、vector动态创建数组
• 88-merge-sorted-array，88.cpp

(3) Stack:

• 20-valid-parentheses，20.cpp
• 71-simplify-path，TBD
• 150-evaluate-reverse-polish-notation，150.cpp，参考：C++中int型与string型互相转换
• 496-next-greater-element-i，496.cpp
• 844-backspace-string-compare，844.cpp，参考：C++ 将 std::string 转换为 char*

(4) Tree:

• 94-binary-tree-inorder-traversal，94.cpp，参考：二叉树的非递归遍历
• 98-validate-binary-search-tree，98.cpp
• 100-same-tree，100.cpp
• 101-symmetric-tree，101.cpp
• 102-binary-tree-level-order-traversal，102.cpp，参考：vector的reserve和resize
• 103-binary-tree-zigzag-level-order-traversal，103.cpp
• 104-maximum-depth-of-binary-tree，104.cpp，参考：vector反转reverse
• 105-construct-binary-tree-from-preorder-and-inorder-traversal，105.cpp，参考：STL里Vector的assign()函数用法，已知前序（后序）遍历序列和中序遍历序列构建二叉树（Leetcode相关题目）
• 106-construct-binary-tree-from-inorder-and-postorder-traversal，106.cpp
• 107-binary-tree-level-order-traversal-ii，107.cpp
• 112-path-sum，112.cpp
• 113-path-sum-ii，113.cpp
• 144-binary-tree-preorder-traversal，144.cpp
• 145-binary-tree-postorder-traversal，145.cpp
• 437-path-sum-iii，437.cpp
• 513-find-bottom-left-tree-value，513.cpp
• 515-find-largest-value-in-each-tree-row，515.cpp
• 617-merge-two-binary-trees，617.cpp

(5) String:

• 28-implement-strstr，28.cpp
• 58-length-of-last-word，58.cpp
• 67-add-binary，67.cpp
• 125-valid-palindrome，125.cpp
• 344-reverse-string，344.cpp
• 345-reverse-vowels-of-a-string，345.cpp
• 387-first-unique-character-in-a-string，387.cpp
• 434-number-of-segments-in-a-string，434.cpp
• 459-repeated-substring-pattern，459.cpp
• 520-detect-capital，520.cpp
• 680-valid-palindrome-ii，680.cpp，参考：LeetCode上遇到Runtime Error错误、Valid Palindrome II 验证回文字符串之二
• 709-to-lower-case，709.cpp
• 819-most-common-word，819.cpp

(6) Sorting:

• 56-merge-intervals，56.cpp，参考：解决Line 26: invalid use of non-static member function，how-to-sort-an-stl-vector
• 57-insert-interval，57.cpp
• 75-sort-colors，75.cpp
• 147-insertion-sort-list，147.cpp
• 179-largest-number，179.cpp，参考：Easiest way to convert int to string in C++、Largest Number
• 242-valid-anagram，242.cpp，参考：C++中map的用法
• 349-intersection-of-two-arrays，349.cpp，参考：C++中set的用法