Compilare: user.cpp: In function ‘void citire()’: user.cpp:12:23: warning: variable ‘y1’ set but not used [-Wunused-but-set-variable] int x,y,k,i,j, x1,y1; ^~ user.cpp: In function ‘void afis()’: user.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~