Compilare: main.cpp: In function 'std::vector<int> reuniune()': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < r.size() && p2 < r2.size()) ~~~^~~~~~~~~~ main.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < r.size() && p2 < r2.size()) ~~~^~~~~~~~~~~ main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < r.size()) ~~~^~~~~~~~~~ main.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p2 < r2.size()) ~~~^~~~~~~~~~~ main.cpp: In function 'std::vector<int> intersectie()': main.cpp:72:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < r.size() && p2 < r2.size()) ~~~^~~~~~~~~~ main.cpp:72:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < r.size() && p2 < r2.size()) ~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:142:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == m.size()) ~~^~~~~~~~~~~ main.cpp:150:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~