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Hello codeforces community,
My submission Contest of DIV2A failed in system tests whereas it passed in practice after making one change Link.The only change i made was that i changed if(n-s.size()<0) to if(n<s.size()).I am unable to understand why the initial code didnt work.
Any help would be appreciated.
size() function always returns unsigned int and if u try to store negative numbers then it rotates the cycle and hence -1 is stored as 4294967295(Unsigned int MAX),-2 is stored as 4294967294(Unsigned int MAX-1),....
In test 12 s.size() returns 13 due to which becomes -s.size() becomes 4294967283. now n — s.size() = n + (-s.size()) = 1 + 4294967283 = 4294967284.
Happy coding :)