Compilare: user.cpp: In function ‘void bkt(int, int, long long unsigned int)’: user.cpp:36:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!printed) ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^