/in/foo.cc: In function 'int main()':
/in/foo.cc:122:55: warning: format '%d' expects argument of type 'int', but argument 2 has type 'node' [-Wformat=]
             printf("%d\n", Segment_tree.Query(1, x, y));
                                                       ^
/in/foo.cc: In function 'long long int read()':
/in/foo.cc:34:35: warning: 'ch' is used uninitialized in this function [-Wuninitialized]
     while (ch != '-' && (ch < '0' || ch > '9')) ch = getchar();
                         ~~~~~~~~~~^~~~~~~~~~~~