It solves the problem by mapping each string to a 26-bit mask representing the presence of each letter. It then iterates through the bit masks of the target strings and checks whether any bit mask of the target string, which is missing exactly one bit, exists in the bit masks of the start strings.
This pull request resolves #1362 by solving the problem 2135. Count Words Obtained After Adding a Letter in C++.
It solves the problem by mapping each string to a 26-bit mask representing the presence of each letter. It then iterates through the bit masks of the target strings and checks whether any bit mask of the target string, which is missing exactly one bit, exists in the bit masks of the start strings.