Compilare: main.cpp: In function 'int getNext(int, int, int)': main.cpp:54:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr == it->second.size()) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'char getch(FILE*)': main.cpp:19:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BUFF, fin); ^