Compilare: main.cpp: In function 'int main()': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;(1<<i)<=n;i++); ~~~~~~^~~ main.cpp:12:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pesti.in","r",stdin); ^ main.cpp:13:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pesti.out","w",stdout); ^ main.cpp:15:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu%llu",&n,&x); ^