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1. Timus: DP Timus: DP

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   #include <iostream>

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   #include <cmath>

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   using namespace std;

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   constexpr int MAXN = 1e3 + 1;

2. Timus: Data Structure Timus: Data Structure

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   // Source: http://acm.timus.ru/problem.aspx?space=1&num=1494

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   #include <iostream>

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   #include <stack>

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   using namespace std;

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3. LeetCode: Graph LeetCode: Graph

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   // Source: https://leetcode.com/problems/symmetric-tree/

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   /**

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    * Definition for a binary tree node.

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    * struct TreeNode {

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    *     int val;