Replace wildcards in a binary string avoiding three identical consecutive letters

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Given a string S of length N, return a string that is the result of replacing each '?' in the string S with an 'a' or a 'b' character and does not contain three identical consecutive letters (in other words, neither 'aaa' not 'bbb' may occur in the processed string).

Examples:

Given S="a?bb", output= "aabb"

Given S="??abb", output= "ababb" or "bbabb" or "baabb"

Given S="a?b?aa", output= "aabbaa"

1<=n<= 500000

I solved the problem using backtracking, but my solution is slow and won't work for greater N values, is there a better approach?



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