Compilare: user.cpp: In function ‘void lee()’: user.cpp:50:22: warning: narrowing conversion of ‘-1.0e+0’ from ‘double’ to ‘int’ inside { } [-Wnarrowing] int dc[]={1,0,-1.0}; ^ user.cpp:67:14: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[v.lin][v.col]==0) ^ cc1plus: warning: iteration 2u invokes undefined behavior [-Waggressive-loop-optimizations] user.cpp:63:8: note: containing loop for(k=0;k<=3;k++) ^