Compilare: user.cpp: In function ‘void printVector(std::vector<int>)’: user.cpp:21:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vect.size(); ++i) { ^ user.cpp: In function ‘std::vector<int> merge(std::vector<int>, std::vector<int>)’: user.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pl < left.size() && pr < right.size()) { ^ user.cpp:30:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pl < left.size() && pr < right.size()) { ^ user.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pl < left.size()) { ^ user.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pr < right.size()) { ^