Compilare: user.cpp: In function ‘int main()’: user.cpp:39:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] flag[j] = 0; ^ user.cpp:45:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] flag[a[x+1]] = 1; ^ user.cpp:49:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!flag[j]) ^ user.cpp:52:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (flag[j] <= 'z') ^ user.cpp:20:7: warning: unused variable ‘c’ [-Wunused-variable] char c = 'b'; ^ user.cpp:13:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &n, &x, &i); ^ user.cpp:30:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^ user.cpp:52:14: warning: array subscript is above array bounds [-Warray-bounds] if (flag[j] <= 'z') ^