Compilare: user.cpp: In function ‘int pref(int, int)’: user.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(amT[nod] == vr) ^ user.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(amT[nod] == vr) ^ user.cpp: In function ‘bool dfs(long long unsigned int, long long unsigned int)’: user.cpp:69:17: warning: unused variable ‘T’ [-Wunused-variable] int T = nod; ^ user.cpp: In function ‘int main()’: user.cpp:117:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i++) { ^