Compilare: main.cpp: In member function 'char InParser::read_ch()': main.cpp:19:31: 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, 400096, fin); ^ main.cpp: In function 'void ciur()': main.cpp:140:13: warning: iteration 200000 invokes undefined behavior [-Waggressive-loop-optimizations] if (!c[i]) ~~~^ main.cpp:139:21: note: within this loop for (int i = 2; i <= 1000000; i++) ~~^~~~~~~~~~ main.cpp:134:10: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations] c[i] = 1; ~~~~~^~~ main.cpp:133:21: note: within this loop for (int i = 4; i <= 1000000; i += 2) ~~^~~~~~~~~~