Compilare: user.cpp: In function ‘int main()’: user.cpp:51:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(A+1, 2000001, fin); ^ user.cpp:52:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(B+1, 2000001, fin); ^