Compilare: main.cpp: In member function 'char InParser::read_ch()': main.cpp:17:38: 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, 4096, fin); ^ main.cpp: In function 'int main()': main.cpp:72:14: warning: iteration 20 invokes undefined behavior [-Waggressive-loop-optimizations] lg2[i] = 1 + lg2[i >> 1]; ~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:71:19: note: within this loop for( i = 2; i <= NMAX; ++i ) ~~^~~~~~~