View Compilation Error

0_0_7872806_16216.cpp: In function `int main()':
0_0_7872806_16216.cpp:29: error: ISO C++ forbids declaration of `itr' with no type
0_0_7872806_16216.cpp:29: error: cannot convert `std::_Rb_tree_iterator<std::pair<const int, std::pair<int, int> > >' to `int' in initialization
0_0_7872806_16216.cpp:29: error: no match for 'operator!=' in 'itr != (&ballon)->std::map<_Key, _Tp, _Compare, _Alloc>::end [with _Key = int, _Tp = std::pair<int, int>, _Compare = std::less<int>, _Alloc = std::allocator<std::pair<const int, std::pair<int, int> > >]()'
0_0_7872806_16216.cpp:30: error: base operand of `->' is not a pointer
0_0_7872806_16216.cpp:31: error: base operand of `->' is not a pointer
0_0_7872806_16216.cpp:32: error: base operand of `->' is not a pointer