Compilare: main.cpp: In function 'void dfs(int)': main.cpp:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<v[r].size(); i++) ~^~~~~~~~~~~~ main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<v[r].size(); i++) ~^~~~~~~~~~~~ main.cpp:42:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (lg = 2; lg<=v[r].size(); lg++) ~~^~~~~~~~~~~~~ main.cpp:43:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<=v[r].size()-lg; i++) ~^~~~~~~~~~~~~~~~