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View Compilation Error

0_0_2673623_6042.cpp: In function `int main()':
0_0_2673623_6042.cpp:18: error: `cin' undeclared (first use this function)
0_0_2673623_6042.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2673623_6042.cpp:21: error: invalid conversion from `int' to `const char*'
0_0_2673623_6042.cpp:21: error:   initializing argument 1 of `std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'
0_0_2673623_6042.cpp:22: error: expected init-declarator before '!=' token
0_0_2673623_6042.cpp:22: error: expected `,' or `;' before '!=' token
0_0_2673623_6042.cpp:22: error: could not convert `(&it)->std::_Rb_tree_iterator<_Tp>::operator++ [with _Tp = std::pair<const std::string, int>]()' to `bool'
0_0_2673623_6042.cpp:22: error: expected `;' before ')' token
0_0_2673623_6042.cpp:23: error: no match for 'operator>' in '(&it)->std::_Rb_tree_iterator<_Tp>::operator-> [with _Tp = std::pair<const std::string, int>]()->std::pair<const std::string, int>::second > cnt'
0_0_2673623_6042.cpp:24: error: `cout' undeclared (first use this function)
0_0_2673623_6042.cpp:24: error: `endl' undeclared (first use this function)


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