Compilare: main.cpp: In function 'int main()': main.cpp:116:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < vals.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'int Real(int)': main.cpp:56:12: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^~~~ main.cpp: In function 'int main()': main.cpp:139:57: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] out << vals[Real(nr_vals / 2 + nr_vals % 2) - 1].val << "\n"; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~