Compilare: user.cpp: In function ‘int Suma(std::vector<int>)’: user.cpp:14:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < a.size() ; ++i){ ^ user.cpp: In function ‘int SumaMaxima(std::vector<int>)’: user.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < a.size() ; ++i){ ^ user.cpp: In function ‘int Paranteza(int&)’: user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( ; x < s.size() ; ++x){ ^ user.cpp:49:9: warning: unused variable ‘startx’ [-Wunused-variable] int startx = 0; ^ user.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type] } ^