Compilare: user.cpp: In function ‘int main()’: user.cpp:19:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] fscanf( fin, "%d", &mat[i][j] ); ^ user.cpp:19:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] fscanf( fin, "%d", &mat[i][j] ); ^ user.cpp:28:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] c += mat[i][j] * (1 - 2 * ( ( bin >> i ) & 1 ) ); ^ user.cpp:28:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] c += mat[i][j] * (1 - 2 * ( ( bin >> i ) & 1 ) ); ^ user.cpp:15:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%hhu%hhu", &n, &m ); ^ user.cpp:19:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &mat[i][j] ); ^