Compilare: user.cpp: In function ‘int main()’: user.cpp:53:16: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.cpp:61:13: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp:96:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tren.size(); i++) ^ user.cpp:72:13: warning: unused variable ‘statie’ [-Wunused-variable] int statie = v[i].statie; ^