Compilare: user.cpp: In function ‘void add(Node*, int)’: user.cpp:30:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(node->v[c]==0){ ^ user.cpp:31:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->v[c]=new Node; ^ user.cpp:34:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] add(node->v[c],p+1); ^ user.cpp: In function ‘int main()’: user.cpp:70:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.in","r",stdin); ^ user.cpp:71:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.out","w",stdout); ^ user.cpp:72:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:76:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:108:34: warning: ‘ji’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d",res,ji+1,jj); ^ user.cpp:96:13: warning: ‘jj’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pp2==jj) ^