Eroare de compilare: user.cpp:5:8: error: expected constructor, destructor, or type conversion before ‘(’ token freopen("alibaba.in","r",stdin); ^ user.cpp:6:8: error: expected constructor, destructor, or type conversion before ‘(’ token freopen("alibaba.out","w",stdout); ^ user.cpp: In function ‘int main()’: user.cpp:23:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:25:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=-1;i<=n-1;i++) scanf("%c",&nr[i]); ^