Compilare: user.cpp: In function ‘int val(int, int)’: user.cpp:63:18: warning: statement has no effect [-Wunused-value] a[x][y].c; ^ user.cpp:11:20: warning: unused variable ‘j’ [-Wunused-variable] int n,nr,i,z,s,j,l,c; ^ /tmp/cc2d7ETF.o: In function `main': user.cpp:(.text.startup+0xbd): warning: the `gets' function is dangerous and should not be used.