Compilare: user.cpp: In function ‘void read()’: user.cpp:20:11: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,x,y,n,m; ^ user.cpp:20:13: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,x,y,n,m; ^ user.cpp: In function ‘int ok(int, int)’: user.cpp:36:23: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i<1 || j<1 || i>n || j>n) ^ user.cpp: In function ‘void lee()’: user.cpp:36:23: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:34:9: note: ‘n’ was declared here int n; ^