Compilare: main.cpp: In function 'void bfs()': main.cpp:41:21: 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:108:8: warning: unused variable 'nod' [-Wunused-variable] int nod = j; ^~~ main.cpp:146:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s1.size(); i++) ~~^~~~~~~~~~~