Compilare: user.cpp: In function ‘void df_inainte(int)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ls[x].size(); i++) ^ user.cpp: In function ‘void df_inapoi(int)’: user.cpp:27:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < lsR[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sol[i].size(); j++) ^