Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nod!=1) while(j<plec[nod].size() &&plec[nod][j].first==0) j++; ~^~~~~~~~~~~~~~~~~ user.cpp:23:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=(nod!=1);i<fii[nod].size();i++){ ~^~~~~~~~~~~~~~~~ user.cpp:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<plec[nod].size() &&plec[nod][j].first==i){ ~^~~~~~~~~~~~~~~~~ user.cpp:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<plec[nod].size() &&plec[nod][j].first==0){ ~^~~~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int, int)’: user.cpp:55:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<plec[nod].size() &&plec[nod][j].first==0){ ~^~~~~~~~~~~~~~~~~ user.cpp:76:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nod!=1) while(j<plec[nod].size() &&plec[nod][j].first==0) j++; ~^~~~~~~~~~~~~~~~~ user.cpp:78:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=(nod!=1);i<fii[nod].size();i++){ ~^~~~~~~~~~~~~~~~ user.cpp:79:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<plec[nod].size() &&plec[nod][j].first==i){ ~^~~~~~~~~~~~~~~~~