Compilare: main.cpp:2:0: warning: ignoring #pragma gcc optimize [-Wunknown-pragmas] #pragma gcc optimize("O3") main.cpp: In function 'void dfs1(int, int)': main.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int, long long int)': main.cpp:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:126:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < gg.size(); ++i) ~~^~~~~~~~~~~ main.cpp: In function 'void dfs3(int, int, long long int)': main.cpp:133:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:147:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[nod].size(); ++j) ~~^~~~~~~~~~~~~~~ main.cpp:132:9: warning: unused variable 'nrf' [-Wunused-variable] int nrf = 0; ^~~