Compilare: user.cpp: In function ‘int main()’: user.cpp:21:22: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[500010]’ [-Wformat=] fscanf(in,"%s",&c); ^ user.cpp:38:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] k=a[c[i]]; ^ user.cpp:39:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] l=b[c[i]]; ^ user.cpp:21:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%s",&c); ^