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my solution has time complexity of O(n*k) k = first k characters from a to z n = size of string but solution got TLE how to optimize it? link to the question and my solution:
https://codingcompetitions.withgoogle.com/kickstart/round/0000000000435c44/00000000007ebe5e
https://www.codechef.com/viewsolution/46839080
thanks in advance
