Compilare: user.cpp: In function ‘void sorteaza()’: user.cpp:60:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[xx].size();i++) ^ user.cpp: In function ‘void det_inc(int)’: user.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<st[xx].size();j++) ^ user.cpp: In function ‘void det_sf(int)’: user.cpp:88:26: 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:95:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s[x].size();i++) ^ user.cpp:94:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^