Update 5_Silver_2P.md

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 ---
 slug: /silver/two-pointers
 title: "Two Pointers"
-author: Unknown
+author: Darren Yao
 order: 5
 prerequisites:
  - 
      - Silver - Sorting
 ---
 
-   - CPH 8.1
+# Two Pointers
+Iterating two monotonic pointers across an array to search for a pair of indices satisfying some condition in O(n).
 
-See 14.1 of https://www.overleaf.com/project/5e73f65cde1d010001224d8a
+# Tutorials
+- Intro to USACO, 14.1: [Java](http://darrenyao.com/usacobook/java.pdf) [C++](http://darrenyao.com/usacobook/cpp.pdf) 
+- CPH 8.1
 
-<!-- END DESCRIPTION -->
+# Problems
+- [CSES Sum of Two Values](https://cses.fi/problemset/task/1640)
+- [CSES Maximum Subarray Sum](https://cses.fi/problemset/task/1643)
+
+# Extensions
+The two pointers technique can be extended to the two dimensional sliding window algorithm. If you're looking for a more challenging problem using 2-D sliding window, see [USACO Fort Moo](http://usaco.org/index.php?page=viewproblem2&cpid=600)
+
+<!-- END DESCRIPTION -->