Compilare: main.cpp: In function 'std::vector<int> Merge(std::vector<int>, std::vector<int>)': main.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=a.size(); i++) ~^~~~~~~~~~ main.cpp:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<=b.size(); j++) ~^~~~~~~~~~ main.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=a.size(); i++) ~^~~~~~~~~~ main.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<=b.size(); j++) ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:99:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); i++) ~^~~~~~~~~~~