Compilare: main.cpp: In function 'std::vector<int> reu(std::vector<int>, std::vector<int>)': main.cpp:60:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size() && j < b.size()) ~~^~~~~~~~~~ main.cpp:79:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size()) ~~^~~~~~~~~~ main.cpp:84:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < b.size()) ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> inter(std::vector<int>, std::vector<int>)': main.cpp:97:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<a.size() && j<b.size()) ~^~~~~~~~~ main.cpp:97:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<a.size() && j<b.size()) ~^~~~~~~~~ main.cpp: In function 'std::vector<int> dif(std::vector<int>, std::vector<int>)': main.cpp:117:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<a.size() && j<b.size()) ~^~~~~~~~~ main.cpp:117:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<a.size() && j<b.size()) ~^~~~~~~~~ main.cpp:132:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<a.size()) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:175:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i<f.size(); i++) ~^~~~~~~~~