//string encrypting //by baptiste prunier //try to decypher the logic //without looking at the code ;) #include #include #include using namespace std; template struct Element{ Element *next=nullptr; T value; }; class Cryptor{ Element *code=nullptr; char * text = nullptr; unsigned size; public: Cryptor(string s); void encode(char c); string decode(); string get(); }; int main() { string text; cin>>text; Cryptor c(text); cout<<"Try to find how I encrypted your text (capital letters become none capital) : "<c2?c1-c2:c1-c2+26); } char lower(char c){ if(c>='A' && c<='Z'){ c-='A' - 'a'; } return c; } bool isAlpha(char c){ return (c>='a' && c<='z'); } Cryptor::Cryptor(string s){ const char * cs = s.c_str(); text=new char[s.size()+1]; if(!text) throw "Allocation error"; copy(cs,cs+s.size()+1,text); for_each(text,text+s.size(),[](char& c){return (c=lower(c));}); size=s.size(); } void Cryptor::encode(char c){ char toAdd; int nxt=1, i=size; Element *cd=new Element(); cd->value=c; cd->next=code; code=cd; while(i && nxt>-1){ do{ --i; }while(i && !isAlpha(text[i])); nxt=i; do{ --nxt; }while(nxt>-1 && !isAlpha(text[nxt])); if(nxt>-1 && isAlpha(text[i]) && isAlpha(text[nxt])){ text[i]=(text[i]+text[nxt]-2*'a')%26+'a'; }else if(isAlpha(text[i])){ text[i]=(text[i]+c-2*'a')%26+'a'; } } } string Cryptor::decode(){ char * res = new char[size+1]; char toSub; int i; Element *e=code; if(!res) throw "Allocation error"; for(int i=0;ivalue; i=0; while(inext; }else{ e=nullptr; } } string s(res); delete res; return s; } string Cryptor::get(){ return string(text); }

Encrypter, decrypter : try to find how