Compilare: main.cpp: In function 'void dfs(int)': main.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L[nod].size();++i){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:111:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[i].size()-1;++j){ ~^~~~~~~~~~~~~~ main.cpp:112:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(w=j+1;w<G[i].size();++w){ ~^~~~~~~~~~~~ main.cpp:146:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[un].size();++i) ~^~~~~~~~~~~~~ main.cpp:149:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=0;i<G[doi].size();++i) ~^~~~~~~~~~~~~~ main.cpp:160:7: warning: unused variable 'ans' [-Wunused-variable] int ans=0; ^~~ main.cpp:163:8: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized] ans1+=Lev[min1]-Lev[t]; ~~~~^~~~~~~~~~~~~~~~~~