Compilare: main.cpp: In function 'void rec(int&, int, std::vector<int>&, std::vector<int>&, std::vector<int>&, std::vector<int>&)': main.cpp:7:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (linie == aparitii.size()) ~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:9:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (linie == aparitii.size() && y == 1) { ~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:16:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int coloana = 0; coloana < aparitii.size(); coloana++) { ~~~~~~~~^~~~~~~~~~~~~~~~~