Compilare: main.cpp: In function 'int main()': main.cpp:68:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < vec.size()) ~~^~~~~~~~~~~~ main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i <vec.size() && vec[i].val == val) ~~^~~~~~~~~~~ main.cpp:82:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < vec.size()) ~~^~~~~~~~~~~~