Compilare: user.cpp: In function ‘int main()’: user.cpp:58:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size() - 1; i++) ^ user.cpp:59:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < v.size(); j++) ^ user.cpp:65:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ^