From 0b36883c1575f954047e3f8a1d7b7a6cd6c75e30 Mon Sep 17 00:00:00 2001
From: wa008 <2864436211@qq.com>
Date: Fri, 8 Jul 2022 21:12:18 +0800
Subject: [PATCH] add Paper, Algorithm, Coding pratice sites

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 96afffc..4a84b64 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ But knowing the stuff will help you become better! :muscle:*
 - [Big O Cheatsheet](http://bigocheatsheet.com/)
 - :book: [Grokking Algorithms](https://www.goodreads.com/book/show/22847284-grokking-algorithms-an-illustrated-guide-for-programmers-and-other-curio)
 - [Algorithms Visualization](https://www.cs.usfca.edu/~galles/visualization/Algorithms.html)
+- [Algorithms for Competitive Programming](https://cp-algorithms.com/)
 
 ### Data Structures
 - :movie_camera: [UC Berkeley, Data Structures Course](https://sp19.datastructur.es/)
@@ -195,6 +196,8 @@ But knowing the stuff will help you become better! :muscle:*
 - :newspaper: [The Morning Paper](https://blog.acolyer.org/)
 - 📜 [What Every Programmer Should Know About Memory](http://futuretech.blinkenlights.nl/misc/cpumemory.pdf)
 - 📜 [Go To Statement Considered Harmful](https://homepages.cwi.nl/~storm/teaching/reader/Dijkstra68.pdf)
+- :library [Arxiv](https://arxiv.org/)
+- :library [Sci-hub](https://sci-hub.se/)
 
 ### Free Books on Programming
 - :books: [Free Programming Books](https://github.com/EbookFoundation/free-programming-books)
@@ -244,3 +247,4 @@ But knowing the stuff will help you become better! :muscle:*
 - :link: [InterviewCake](https://www.interviewcake.com/)
 - :link: [At Coder](https://atcoder.jp/)
 - :link: [Codility](https://www.codility.com/)
+- :link: [Spoj](https://www.spoj.com/)