Compilare: user.cpp: In function ‘int binarySearch(int, int)’: user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans+step <= v[value].size() && v[value][ans+step-1] <= idx) ^ user.cpp: In function ‘char getChar()’: user.cpp:87:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos == BUF) pos = 0, fread(buf, 1, BUF, fin); ^