Compilare: main.cpp: In function 'void bfs(std::vector<int>&, std::vector<std::vector<nod> >)': main.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < liste[top].size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:111:8: warning: unused variable 'nod' [-Wunused-variable] int nod = j; ^~~ main.cpp:149:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s1.size(); i++) ~~^~~~~~~~~~~