Compilare: user.cpp: In function ‘void prim()’: user.cpp:12:43: warning: variable ‘tree’ set but not used [-Wunused-but-set-variable] int i,j,k=0,l=0,x,nr[10],temp,min_cost=0,tree[10][3];//tree-poz 0-pct 1,poz1-pct2,poz3-val ^ user.cpp:62:17: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] tree[i][0]=nr[x]; ^