Compilare: main.cpp: In function 'void dfsinit1(int)': main.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[pz].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'void dfsinit2(int)': main.cpp:56:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[pz].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'void query2(int)': main.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vc.size();++i) ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:111:17: warning: unused variable 'j' [-Wunused-variable] long long n,j,i,k; ^ main.cpp:111:21: warning: unused variable 'k' [-Wunused-variable] long long n,j,i,k; ^