Compilare: main.cpp: In function 'long long int dfs(long long int)': main.cpp:11:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:10:17: warning: unused variable 'j' [-Wunused-variable] long long i,j,aux,cnt=0,verif[15020],max1=0,max2=0,ok,okk=1; ^ main.cpp:10:29: warning: variable 'verif' set but not used [-Wunused-but-set-variable] long long i,j,aux,cnt=0,verif[15020],max1=0,max2=0,ok,okk=1; ^~~~~ main.cpp:10:42: warning: unused variable 'max1' [-Wunused-variable] long long i,j,aux,cnt=0,verif[15020],max1=0,max2=0,ok,okk=1; ^~~~ main.cpp:10:49: warning: unused variable 'max2' [-Wunused-variable] long long i,j,aux,cnt=0,verif[15020],max1=0,max2=0,ok,okk=1; ^~~~ main.cpp:10:56: warning: variable 'ok' set but not used [-Wunused-but-set-variable] long long i,j,aux,cnt=0,verif[15020],max1=0,max2=0,ok,okk=1; ^~ main.cpp: In function 'int main()': main.cpp:66:17: warning: unused variable 'j' [-Wunused-variable] long long i,j,x,y,aux,okk=1; ^ main.cpp:100:23: warning: 'aux' may be used uninitialized in this function [-Wmaybe-uninitialized] valmax=aux; ~~~~~~^~~~