Compilare: user.cpp: In function ‘int backtrack(int, char)’: user.cpp:60:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] din[x][a]++; ^ user.cpp:61:37: warning: value computed is not used [-Wunused-value] backtrack(x + 1, a) + 1; ^ user.cpp:65:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp:60:25: warning: array subscript is above array bounds [-Warray-bounds] din[x][a]++; ^ user.cpp:60:25: warning: array subscript is above array bounds [-Warray-bounds]