Compilare: main.cpp: In function 'void add(std::vector<int>&, std::vector<int>&, std::vector<int>&)': main.cpp:11:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0, j=0; i<a.size() or j<b.size(); i++, j++){ ~^~~~~~~~~ main.cpp:11:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0, j=0; i<a.size() or j<b.size(); i++, j++){ ~^~~~~~~~~ main.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size()) da = a[i]; ~~^~~~~~~~~~ main.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < b.size()) db = b[j]; ~~^~~~~~~~~~