Compilare: user.cpp: In function ‘void prep()’: user.cpp:32:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < d[i].size(); j++) ^ user.cpp:37:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < carte.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:73:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= carte.size(); ++i) ^