Compilare: main.cpp: In function 'void afisare()': main.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=1; l<g.size(); l++) ~^~~~~~~~~ main.cpp:44:23: 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:55:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(g[i][0].first<g.size()) main.cpp:64:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(g[m][0].first==g[m].size() && k==1) main.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(g[i][0].first>=g[i].size() && !col.empty()) main.cpp:78:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(! col.empty() || g[i][0].first<g[i].size()); main.cpp: In function 'int main()': main.cpp:92:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<g.size(); i++) ~^~~~~~~~~