Compilare: main.cpp: In function 'void afisare(std::vector<int>)': main.cpp:65:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ~^~~~~~~~~ main.cpp: In function 'void copie(std::vector<int>&, std::vector<int>)': main.cpp:95:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<b.size(); i++) ~^~~~~~~~~ main.cpp: In function 'void intersectie(std::vector<int>&, std::vector<int>, std::vector<int>)': main.cpp:104:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp:104:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp: In function 'void reuniune(std::vector<int>&, std::vector<int>, std::vector<int>)': main.cpp:125:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp:125:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp:147:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size()) ~~^~~~~~~~~~ main.cpp:149:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size()) ~~^~~~~~~~~~ main.cpp:158:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < b.size()) ~~^~~~~~~~~~