Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:14:18: 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)': main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs3(int)': main.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<w[nod].size();++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'void golesc(int)': main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<w[nod].size();++i) --grad[w[nod][i]]; ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[pl[mare][0]].size();++i) sol.push_back(vt[pl[mare][0]][i]); ~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pl[mare].size();--i) golesc(pl[mare][i]); ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<w[i].size();++j) vt[i].push_back(w[i][j]); ~^~~~~~~~~~~~ main.cpp:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) ~^~~~~~~~~~~~ main.cpp:115:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) g<<sol[i]<<' '; ~^~~~~~~~~~~