Compilare: user.cpp: In function ‘std::istream& operator>>(std::istream&, triunghi&)’: user.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:70:8: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<c; ^