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Lacking proper const conrrectness and use of const refereces where ever possible.
careless use of copy and having too many memory leaks.
4.Lot of redundancy in problem information ex:- some problems give you length of string as input and then the string. why ? you can find the length directly from the string alone.
These do become important when you do real world programming for production quality code.
Magic Spells
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All most all code examples in hackerrank C++ are
These do become important when you do real world programming for production quality code.
just FYI:-