Compilare: main.cpp: In function 'void afisare()': main.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=1; l<g.size(); l++) ~^~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[l].size(); j++) ~^~~~~~~~~~~~ main.cpp: In function 'void bfs(int)': main.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(g[i][0].first<g.size()) main.cpp:71:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(g[i][0].first>=g[i].size() && !col.empty()) main.cpp: In function 'int main()': main.cpp:96:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<g.size(); i++) ~^~~~~~~~~