Compilare: user.cpp: In function ‘int main()’: user.cpp:13:20: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000001]’ [-Wformat=] fscanf(fin,"%s", &a); ^ user.cpp:14:20: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000001]’ [-Wformat=] fscanf(fin,"%s", &b); ^ user.cpp:13:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s", &a); ^ user.cpp:14:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s", &b); ^