This shows compilation error. why? please correct me.
Compress string
you are trying to access ith character of the string sto while you havent initialized it so instead use += which would append the given character at the back. moreover your logic is wrong answer for aaabbbaaa would be a3b3a3 but by your logic it would be a6b3,
easiest way to implement is to keep the current count and as the character changes then print the character followed by count no need to store everything in string
Code for reference purpose:
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