Discussions

Clean C++ solution, beats most submissions. Work with character counts or indices rather than building new strings in the loop; string concatenation inside loops is what usually causes TLE here.

Clean Python solution, beats most submissions. Work with character counts or indices rather than building new strings in the loop; string concatenation inside loops is what usually causes TLE here.

Finally got AC after 3 WAs. Sharing what I missed. Work with character counts or indices rather than building new strings in the loop; string concatenation inside loops is what usually causes TLE here.