Compilare: user.cpp: In function ‘void Sort()’: user.cpp:34:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[xx].size(); i++) { ^ user.cpp: In function ‘void det_sf(int)’: user.cpp:58:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s[xx].size(); i++) ^ user.cpp: In function ‘void rezolva(int)’: user.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s[x].size(); i++) ^