Compilare: main.cpp: In function 'int main()': main.cpp:19:30: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(patt, 2000005, fin); ^ main.cpp:20:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(txt, 2000005, fin); ^