View Compilation Error

0_0_1824306_14457.cpp: In function `int main()':
0_0_1824306_14457.cpp:23: error: `cin' undeclared (first use this function)
0_0_1824306_14457.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1824306_14457.cpp:29: error: cannot convert `std::_Rb_tree_const_iterator<std::string>' to `int' in initialization
0_0_1824306_14457.cpp:29: error: no match for 'operator!=' in 'd != (&c)->std::set<_Key, _Compare, _Alloc>::end [with _Key = std::string, _Compare = std::less<std::string>, _Alloc = std::allocator<std::string>]()'
0_0_1824306_14457.cpp:30: error: invalid type argument of `unary *'
0_0_1824306_14457.cpp:32: error: name lookup of `k' changed for new ISO `for' scoping
0_0_1824306_14457.cpp:29: error:   using obsolete binding at `k'