Compilare: user.c: In function ‘main’: user.c:41:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] cop(d[lin][j][0], d[lin][j - 1][1]); ^ user.c:41:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] user.c:44:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] cop(d[lin][j][1], d[!lin][j][0]); ^ user.c:45:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] add(d[lin][j][1], d[!lin][j][1]); ^ user.c:24:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^