Compilare: main.cpp: In function 'void populate(std::vector<long int>&, int, std::vector<long int>&, std::vector<long int>&)': main.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!lpr_left.empty() && pos * 2 < a.size()) ~~~~~~~~^~~~~~~~~~ main.cpp:26:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!lpr_right.empty() && pos * 2 + 1 < a.size()) ~~~~~~~~~~~~^~~~~~~~~~