Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs_(int, int)': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vecini[nod].size(); i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:84:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<vecini[i].size(); j++) ~^~~~~~~~~~~~~~~~~ main.cpp:94:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<vecini[i].size(); j++) ~^~~~~~~~~~~~~~~~~ main.cpp:103:39: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations] for(int i=2; i<=100005; i++) lg[i]=lg[i/2]+1; ~~~~~^~~~~~~~~~ main.cpp:103:19: note: within this loop for(int i=2; i<=100005; i++) lg[i]=lg[i/2]+1; ~^~~~~~~~