Compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[1000010]’ [-Wformat=] scanf("%d\n%s",&n,&s); ^ user.cpp:16:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[0]=NULL; ^ user.cpp:10:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text5.in","r",stdin); ^ user.cpp:11:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text5.out","w",stdout); ^ user.cpp:13:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s",&n,&s); ^