Compilare: main.cpp: In function 'long long int get_freq(std::vector<long long int>&, long long int)': main.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < a.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'long long int cate_mici(std::vector<long long int>&, long long int)': main.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < a.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'long long int solve(std::vector<long long int>&, long long int)': main.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < a.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:111:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long long i = 0; i < a.size(); ++i) { ~~^~~~~~~~~~