Compilare: main.cpp: In function 'void update(int, int, int, int, int)': main.cpp:107:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = pos; i <= chain[index].size(); i += i & (-i)) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:187:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((1 << (e + 1)) <= chain[i].size()) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void read_buffer()': main.cpp:19:50: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, sizeof(char), BUFFER_SIZE, fin); ^