Compilare: user.cpp: In function ‘void solve()’: user.cpp:85:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (n & (1 << i)) ^ user.cpp: In function ‘void input()’: user.cpp:75:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &k, &mod); ^ user.cpp: In function ‘int main()’: user.cpp:97:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xreverse.in","r",stdin); ^ user.cpp:98:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xreverse.out","w",stdout); ^