Compilare: main.cpp: In function 'std::vector<int> Plus(std::vector<int>, std::vector<int>)': main.cpp:16:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) { ~~^~~~~~~~~~ main.cpp:16:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) { ~~^~~~~~~~~~ main.cpp:31:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size()) { ~~^~~~~~~~~~ main.cpp:35:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < b.size()) { ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> Ori(std::vector<int>, std::vector<int>)': main.cpp:45:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) { ~~^~~~~~~~~~ main.cpp:45:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:118:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (P < aux.size()) { ~~^~~~~~~~~~~~ main.cpp:129:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < E.size(); i++) ~~^~~~~~~~~~