Compilare: main.cpp: In function 'll variante(std::vector<long long int>)': main.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i = 0; i <= v.size(); i++) { ~~^~~~~~~~~~~ main.cpp:68:17: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] while(i - k + 1 > 0 && i + k <= n && v[i - k + 1] == v[i + k]) { ~~^~~