Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int lca(int, int)': main.cpp:64:69: warning: self-comparison always evaluates to false [-Wtautological-compare] if(dist[x][i].first && dist[y][i].first && dist[x][i].first != dist[x][i].first) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~