Compilare: user.cpp: In function ‘int main()’: user.cpp:52:38: warning: NULL used in arithmetic [-Wpointer-arith] for(j=1;mat[cale[k]][j]!=NULL;++j) ^ user.cpp:56:22: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] rez[i][nr[i]]=NULL; ^ user.cpp:17:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.in","r",stdin); ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.out","w",stdout); ^ user.cpp:20:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^