Compilare: main.cpp: In function 'void DFS(int, int)': main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[nod].size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int query(int, int)': main.cpp:51:35: warning: self-comparison always evaluates to false [-Wtautological-compare] if (level[varf[chain[x]]] < level[varf[chain[x]]]) ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~