Compilare: user.cpp: In function ‘int extend(short int, short int)’: user.cpp:26:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[i+dx[k]][j+dy[k]] > a[i][j]) ^ user.cpp:26:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[i+dx[k]][j+dy[k]] > a[i][j]) ^ user.cpp:27:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] _max = max(_max, extend(i+dx[k], j+dy[k])+1); ^ user.cpp:27:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] _max = max(_max, extend(i+dx[k], j+dy[k])+1); ^ user.cpp: In function ‘int main()’: user.cpp:49:38: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘short int*’ [-Wformat=] fscanf(in, "%d", &a[i][j]); ^ user.cpp:37:22: warning: unused variable ‘x’ [-Wunused-variable] int n, _max = 0, x, y, i_max, val; ^ user.cpp:37:25: warning: unused variable ‘y’ [-Wunused-variable] int n, _max = 0, x, y, i_max, val; ^ user.cpp:37:28: warning: unused variable ‘i_max’ [-Wunused-variable] int n, _max = 0, x, y, i_max, val; ^ user.cpp:40:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:49:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i][j]); ^