View Compilation Error

0_0_34000209_10951.cpp: In member function 'int st::init_tree(int, int)':
0_0_34000209_10951.cpp:69:29: error: no matching function for call to 'ex::init(int)'
    tree[pos].inf.init(read());
                             ^
0_0_34000209_10951.cpp:69:29: note: candidate is:
0_0_34000209_10951.cpp:26:6: note: int ex::init(int&)
  int init(int &x){
      ^
0_0_34000209_10951.cpp:26:6: note:   no known conversion for argument 1 from 'int' to 'int&'