Compilare: main.cpp: In function 'void dfsdown(int)': main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[pz].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'void dfsup(long long int)': main.cpp:46:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i=0;i<v[pz].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:17: warning: unused variable 't' [-Wunused-variable] long long q,t,m,i,j; ^ main.cpp:86:19: warning: unused variable 'm' [-Wunused-variable] long long q,t,m,i,j; ^