Compilare: main.cpp: In function 'void dfs1(int, int)': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < l[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < l[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[nod].size(); i++) ~~^~~~~~~~~~~~~~~