Compilare: user.cpp: In function ‘int main()’: user.cpp:55:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.in","r",stdin); ^ user.cpp:56:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.out","w",stdout); ^ user.cpp:59:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lu",&n); ^ user.cpp:62:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lu",&a[i]); ^ user.cpp:66:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lu",&m); ^ user.cpp:68:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %lu",&question,&x); ^ user.cpp: In function ‘long unsigned int bin_search_1(long unsigned int, long unsigned int, long unsigned int*, long unsigned int)’: user.cpp:34:15: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(a[pos+1]<=x&&pos<end-1) ^ user.cpp: In function ‘long unsigned int bin_search_2(long unsigned int, long unsigned int, long unsigned int*, long unsigned int)’: user.cpp:50:8: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] pos--; ^