Compilare: user.cpp: In function ‘int main()’: user.cpp:65:29: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for (int i = 2; (1 << i - 1) <= k; ++i) ^ user.cpp:47:19: warning: unused variable ‘b’ [-Wunused-variable] i64 sum, cmb, b; ^ user.cpp: In function ‘char nextch()’: user.cpp:20:36: 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, BMAX, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:45:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("produse.in", "r", stdin); ^ user.cpp:46:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("produse.out", "w", stdout); ^