Squary Given N integer, is it possible to add at least 1 and at most K elements such that the sum of the squares of all elements in list equals square of sum of the all elements? solution Let $$ a_i $$ or A be the list of the given n elements. Let $$ b_j $$ be the list of the elements to add the `A` list. $$(\sum_{i}a_i
solution
Check a letter appearance
First, check all of the middle letters, which all letters other than the first and last consecutive segment of letters.
If a letter in middle letter appears more than one input string, it is impossible to construct the megatower.