Compilare: main.cpp: In function 'std::vector<int> unite(std::vector<int>, std::vector<int>)': main.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(inda<a.size() and indb<b.size()) ~~~~^~~~~~~~~ main.cpp:14:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(inda<a.size() and indb<b.size()) ~~~~^~~~~~~~~ main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(inda<a.size()) ~~~~^~~~~~~~~ main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(indb<b.size()) ~~~~^~~~~~~~~ main.cpp: In function 'std::vector<int> intersect(std::vector<int>, std::vector<int>)': main.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(inda<a.size() and indb<b.size()) ~~~~^~~~~~~~~ main.cpp:33:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(inda<a.size() and indb<b.size()) ~~~~^~~~~~~~~ main.cpp: In function 'void afis(std::vector<int>)': main.cpp:82:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ~^~~~~~~~~