Compilare: main.cpp:2:0: warning: ignoring #pragma gcc optimize [-Wunknown-pragmas] #pragma gcc optimize("O3") main.cpp: In function 'void dfs1(long long int, long long int)': main.cpp:13:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(long long int, long long int, long long int)': main.cpp:91:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:126:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i = 0; i < gg.size(); ++i) ~~^~~~~~~~~~~