Compilare: main.cpp: In function 'bool solve(long long int, long long int, std::vector<long long int>)': main.cpp:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:14: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<ans<<"\n"; ^~~~