C++ Solution for Leetcode Question Numbered, 1, 20, 121, 125, 167, 217, 242, 704, 206, 21, 226, 104, 100

[UnresolvedCold]

I am solving the easy problems from each topic first and then I will go for medium and hard ones.

List of questions solved in this commit,

• 1-Two-Sum.cpp
• 20-Valid-Parentheses.cpp
• 121-Best-Time-to-Buy-and-Sell-Stock.cpp
• 125-Valid-Palindrome.cpp
• 167-Two-Sum-II.cpp
• 217-Contains-Duplicate.cpp
• 242-Valid-Anagram.cpp
• 704-Binary-Search.cpp
• 206-Reverse-Linked-List.cpp
• 21-Merge-Two-Sorted-Lists.cpp
• 226-Invert-Binary-Tree.cpp
• 104-Maximum-Depth-of-Binary-Tree.cpp
• 100-Same-Tree.cpp

[neetcode-gh]

Looks great, tysm!