Compilare: main.cpp: In function 'void calc_pi(std::__cxx11::string)': main.cpp:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<pat.size();) ~^~~~~~~~~~~ main.cpp: In function 'void rez()': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<=s.size();j++) ~^~~~~~~~~~ main.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2*sza-1,ind=sza-1;j<sa.size();j++,ind++) ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=s.size();i++){ ~^~~~~~~~~~ main.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c[j].size()<=i) ~~~~~~~~~~~^~~