Compilare: main.cpp: In function 'void bfs(int)': main.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<a[x].size(); j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<elemente[i].size()-1 && last<catenoduris-1; j++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:69:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(last<singure.size()-1) ~~~~^~~~~~~~~~~~~~~~~