Compilare: main.cpp: In function 'void merge(std::vector<int>&, std::vector<int>&, std::vector<int>&)': main.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pa < a.size() or pb < b.size()){ ~~~^~~~~~~~~~ main.cpp:43:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pa < a.size() or pb < b.size()){ ~~~^~~~~~~~~~ main.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pa == a.size()) ~~~^~~~~~~~~~~ main.cpp:46:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pb == b.size()) ~~~^~~~~~~~~~~