Compilare: user.cpp: In function ‘int main()’: user.cpp:43:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] ord[sir[i]]=1; ^ user.cpp:52:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] arr[0][j]=ord[sir[j]]; ^ user.cpp:38:10: warning: variable ‘ch’ set but not used [-Wunused-but-set-variable] char ch; ^ user.cpp:39:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&k); ^