Count Palindromic Subsequences

Count Prefixes of a Given String

Count Special Integers

Count Square Sum Triples

Count Student Number in Departments

Count Subarrays Where Max Element Appears at Least K Times

Count Subarrays With More Ones Than Zeros

Count Submatrices With All Ones

Count Submatrices With Equal Frequency of X and Y

Count Submatrices with Top-Left Element and Sum Less Than k