滑动窗口: https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/ DFS: https://leetcode-cn.com/problems/generate-parentheses/https://leetcode-cn.com/problems/generate-parentheses/https://leetcode-cn.com/problems/generate-parentheses/ 双指针问题: 三数之和: https://leetcode-cn.com/problems/3sum-closest/submissions/https://leetcode-cn.com/problems/3sum-closest/submissions/ 力扣https://leetcode-cn.com/problems/container-with-most-water/submissions/