Compilare: main.cpp: In function 'void dfs(long long int, long long int)': main.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:50:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j=0;j<v[x].size();j++) ~^~~~~~~~~~~~ main.cpp:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j=0;j<v[x].size();j++) ~^~~~~~~~~~~~ main.cpp:73:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long j=0;j<v[x].size();j++) ~^~~~~~~~~~~~