Number of Substrings Forum Problem Tutorials # ๐ฏ๐ต (ใใใกใใ) AtCoder Library Practice Contest I - Number of Substrings (2D) - ใใใกใใใฎ็ซถใใญ็ฒพ้ฒ่จ้ฒ ๐ฌ๐ง Suffix Array - Algorithms for Competitive Programming ๐ฌ๐ง๐ท๐บ (Alexander Kulkov) Suffix structure lecture Moscow International Workshop ACM ICPC 2015