Compilare: user.cpp: In function ‘int main()’: user.cpp:24:21: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[105]’ [-Wformat=] scanf("%s",&v[i]); ^ user.cpp:27:20: warning: NULL used in arithmetic [-Wpointer-arith] while(v[i][k]!=NULL) ^ user.cpp:19:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.in","r",stdin); ^ user.cpp:20:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.out","w",stdout); ^ user.cpp:21:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:24:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&v[i]); ^