Compilare: user.cpp: In function ‘void readFile()’: user.cpp:37:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[a][b] = ap[b][a] = 1; ^ user.cpp:37:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[a][b] = ap[b][a] = 1; ^ user.cpp:37:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[a][b] = ap[b][a] = 1; ^ user.cpp:37:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[a][b] = ap[b][a] = 1; ^ user.cpp:23:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d\n", &n, &m); ^ user.cpp:29:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c %c\n", &a, &b); ^