Compilare: user.cpp: In function ‘int solveParanthesis(std::__cxx11::string)’: user.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size()-1;i++) ~^~~~~~~~~~~ user.cpp:49:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]!=',' && i<s.size()) nr+=s[i++]; ~^~~~~~~~~ user.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<el.size();i++) ~^~~~~~~~~~ user.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size()-1;i++) ~^~~~~~~~~~~ user.cpp:96:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]!=',' && i<s.size()) nr+=s[i++]; ~^~~~~~~~~ user.cpp:105:1: warning: control reaches end of non-void function [-Wreturn-type] } ^