What is SIGSEGV help me out…
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@root00198 you are not checking the case when the length of the string is less than 3, in that case, your solution will give runtime error.
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The type that s.length() returned when converted to “long” changed into something else(I dont know why, maybe it returns unsigned long). So, when a string of length 1 was given, 1-2 = -1 and in unsigned type it changed into MAX-1 and it ran until that value ultimately getting out of bounds of the string. I typecasted s.length() to “int” and it worked perfectly fine.
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Hope this helped. 
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The query is already answered . Moreover I would advise you to use char array instead of string .
The error you are geting is because you are missing a case when string length <3
in that case your solution stumbles and faces runtime error !!!
…But why?
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