Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(p,2000010,f);n=strlen(p); ^ user.cpp:26:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,2000010,f);m=strlen(s); ^