Compilare: user.cpp: In function ‘int main()’: user.cpp:30:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a, MAXN + 2, in); ^ user.cpp:31:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(b, MAXN + 2, in); ^