Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i){ ~^~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<GT[x].size();++i){ ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol[i].size();++j){ ~^~~~~~~~~~~~~~